September 2001 - test-drb@ccmp.vtda.org

Wait! There's more including MS-DOS 1.25!!!! was Sanyo MBC-550 (Yuck!) software available

by rigdonj＠intellistar.net

I'm still digging. I found more 550 stuff. I think this is everything that came with the 550. Here's a chance for you 550 owner's to get the whole set at one shot! Original DS-DOS box and invoice. Original Sanyo Easywriter ver 1.3 disk Original Sanyo disk box with 550 dos ver 2.11 and BASIC 1.25, two original Sanyo disk for InfoStar (set B disk 2 and 3 of 4; disks 1 and 4 are below), original Sanyo disk for DOS 1.25 and BASIC ver 1.1 Original Sanyo disk box with all three original disk of set A, WordStar and CalcStar and a backup copy of DS-DOS. Two card board dummy disks used to protect the floppy drives duing shipment. Joe > >A few weeks ago we were talking about the Sanyo 550 series and someone mentioned one of the alternates operating systems that supported 80 track drives in the 550. I said that was DS-DOS by Michtron. > > Today I found an old Sanyo disk package with four disks for the 550. One of them is DS DOS 2.11, one is InfoStar, one is MailMerge/SpellStar and the other is a disk of misc utilities. The first three are original disks. In additon, the InfoStar, MailMerge/SpellStar are Sanyo labeled disks that came with the 550. If anyone wants them, trade me something I can use and they're all your's. > > Joe

13 years, 2 months

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Quadram Quadboard

by geoffr＠zipcon.net

Does anyone have docs for this beastie? it's an apple-II on a card that goes into an XT... or does anyone have any interest in it? it's been sitting on my shelf for ~ 12 years now...

18 years, 4 months

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Interesting Book: "The Digital Dictionary"

by healyzh＠aracnet.com

Yesterday I finally got a couple books I'd gotten on eBay a couple weeks ago, obviously "VAXcluster Principles" is an interesting book, but I was surprised how good of a book "The Digital Dictionary" is. I got the 2nd Edition (the first was mainly internal use). It's a dictionary of all the different terms that were in use around 1986. As such it contains info on the PDP-10, PDP-11, and VAX, as well as DECmate's, Rainbows, and Professionals. As well as the Apps, Languages, and OS's. Great book if you want to know what a specific term or acronym means. Well worth picking up if you are in to DEC stuff and can find a copy! Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

23 years, 6 months

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Info on the Dynalogic Hyperion

by lbutzel＠home.com

Looking for info on the Dynalogic Hyperion, a "portable" DOS machine manufactures around 1983. At least the one I have is 1983. it was designed and initially built in Ottawa, Canada. Hyperion was acquired in about 1983 by Bytec, who was later bought by I think a Quebec company called Comterm. Anyway, mine has stopped working: The machine still boots but no image is displayed on its 7" diag screen. Hence I am looking for service info and/or persons who have worked on the machine. Any leads would be most appreciated. Leo Butzel Seattle, WA lbutzel(a)home.com

23 years, 6 months

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Plato terminal

by dhquebbeman＠theestopinalgroup.com

> This is two years late, but the terminal the original poster describes > sounds like an IST (model 1), a CRT-based CDC product, vintage about 1978. > There was a later edition called the IST-II, also CDC. It had two 8" drives > and a Z-80 CPU, as well as connectivity to CDC PLATO mainframe systems, > either by dialup modem (1200 bps) or multiplexer. Actually, I was the original poster; a reply to me mentioned the terminal you're describing. > The IST is not the oldest PLATO terminal, but it is the oldest that CDC > manufactured, I suspect. Even my PLATO IV (Magnavox, 1971) is not the > oldest, but only the first mass-produced machine. The earliest ones date to > about 1961 and there are probably only two or three still in existence, if > we're lucky enough to have that many. A precursor to these would be Norman > Crowder's Auto-Tutor, vintage about 1958, which has characteristics very > similar to the PLATO terminals (though it is not a computer terminal, it > operates on filmstrip media), and PLATO's mechanisms are said to have been > influenced by this machine. It's one of the mid-70s Magnavox plasma displays I'm looking for... Say, are you able to connect to NovaNET with the magnavox terminal? if so, we should meet for a game of Empire or Avatar some time (although I'm sure you'll wipe me out).... or maybe a more civilized game of chess... Regards, -doug quebbeman

23 years, 8 months

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Diablo 3200

by vcf＠siconic.com

On Mon, 14 May 2001, George Leo Rachor Jr. wrote: > Stay of execution on this Diablo 3200..... > > We have bought a bit of time as my wife has convinced them not to hack it > up until I get to see this critter. Cool! > Obviously we have no software for the machine and I'm assuming you don't > either. Actually, I do. I got the original OS disks as well as a bunch of floppies with various bits of accounting type software and useless data. > The computer recycler has agreed not to remove the original components > until it can be determined if the box is usuable in some rudimentry > function as is. (They were going to gut the original components and > replace the guts with something more modern). Silly. Were they planning to use the same CRT and keyboard? I don't know how. If all they wanted was a nice desk for a computer then maybe they should go to Office Depot? > Now the challenge is to find software that might boot the machine up. I can make copies for you. Mine supposedly boots. Here is a picture of mine. http://www.siconic.com/computers/Diablo%203200.jpg Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org

23 years, 11 months

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I need an RM03...

by DSEAGRAV＠toad.xkl.com

I need an RM03, preferrably within sane driving distance of Peoria, IL. Having a KS10 as a paperweight is absolutely no fun. I can trade PDP-11 stuff for one, I have all sorts of 11 kit that I'd be more than willing to trade for KS10 stuff. Also, if anyone has the 120V-AC plug that goes in a TM02, I am short one of those as well - I have the 220 volt version (but the rest of the drive is all 120 volt parts; Odd!) Basically, I'm sick of using the KS10 as just emulation validation and I want to get it running. ^_^ -------

24 years, 1 month

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Collections vs. accumulations, was Re: How many collectors?

by dhquebbeman＠theestopinalgroup.com

> > > Does anyone know what sort of machine is in the car's > > > onboard controller? A few pictures I've found make them > > > look like PC104's. These machines are hitting zero value > > > quickly and may not last 10 years unless picked up now. > > > > What car? They don't all use the same controllers, you know... > > Want a fuel injection "brain" from a 1968 VW Squareback? Had Bosch come up with EFI already by 1968? Every VW (and Audi & MB, etc) of that vintage that I've seen used CIS, which was a purely mechanical system. I have seen a 1969 Audi Super 90 (wagon) that had an aftermarket Capacitative Discharge Ignition (CDI) System... by 1974, Audis had those as stock, while CIS was still 1 year off... My 1986 Audi 5000 CS Turbo Quattro uses a Motorola 6802-based controller... very simple to upgrade, too.... ;-) -dq

24 years, 2 months

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Heath/Zenith stuff

by ajp166＠bellatlantic.net

------Original Message------ From: Ethan Dicks <ethan_dicks(a)yahoo.com> --- Bill Gunshannon <bill(a)cs.scranton.edu> wrote: > Your thinking of the Heath H11 which was in fact an LSI-11/02. But it had It shipped as an LSI-11/03 CPU and heath made memory and IO. My H-11 came with a KDF-11 CPU (11/23), but I don't know if it was shipped that way or if my boss (who bought it new) upgraded it himself. Yep, never shipped with 11/23 (KDF-11A). It was discontinued by then if anything. I have a couple of the Heath serial cards (one unsoldered!), the H-27 disk controller, the 8" floppies and a pile of misc DEC cards (memory, BDV-11 boot card, etc). The heath seriial card was a fairly flexible card copared to the usual DEC DL-11. to debug the H-27 (he never used it). Except for the monsterous holes he blew in the side to mount additional fans, and the holes in the front he added for external console baud rate switches, it resembles its original form once again. The fans and switches were a common mod and handy too. Allison __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/

24 years, 2 months

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HP Composite Video Interface Card

by fmc＠reanimators.org

"Wayne M. Smith" <wmsmith(a)earthlink.net> wrote: > I am using an HP composite video card (98204A) in a > 9000/200 series and am getting a very small multiple > image on the screen. Is there something special about > HP composite video or is this just a bad card? I've > tried the card in both a 9000/200 and 9000/220 with the > same result. Any ideas? Just a wild guess, but if you have an HP 35731A monochrome monitor, try it with that. That wants composite video but with a horizontal frequency of 30KHz instead of the more usual 15KHz. HP used that on several different systems. There may also be a jumper on the video card to select the horizontal frequency, but the only thing I ever saw this on was the HP Multimode Display Adapter for the Vectra (sort of a combination of the IBM MDA and CGA that was good for confusing "smart" software). -Frank McConnell

24 years, 4 months

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Adventure for 8080

by RCini＠congressfinancial.com

Hello, all: I want to do something fun with the Altair Emulator. Does anyone have a binary for Adventure? I don't yet have the ability to complie programs in the emulator (because of problems booting CP/M), so I could use a memory image. If someone has one, please contact me off line. Thanks. Rich ========================== Richard A. Cini, Jr. Congress Financial Corporation 1133 Avenue of the Americas 30th Floor New York, NY 10036 (212) 545-4402 (212) 840-6259 (facsimile)

24 years, 4 months

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Available: DG Eclipse S/140 Programmer's Reference

by mrbill＠mrbill.net

In my latest box of DEC docs came a "Programmer's Reference Series" manual for an Eclipse S/140, circa 1981 or so. useful to anyone? bill -- Bill Bradford mrbill(a)mrbill.net Austin, TX

24 years, 4 months

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The new VAX is alive!

by rdd＠smart.net

This afternoon, I ordered, and then picked up, a cable with MMJ connectors on it from Control Cable (they're in Woodlawn, MD) - a nice place to deal with; they specialize in cabling and related products, and what they sell appears to be of very good quality. The cost of the assembled cable was only a few cents different from their cost for a cable and two MMJ connectors, and was under US$5; of course, I had to pay US$5 extra since the order was under US$50, but that was no worse than shipping would have been if I'd ordered them from elsewhere. After connecting the VT320 to the VAX, I reset the system password. Fortunately, this VAX has the "real VMS" (TM) for VAXen on it: VAX/VMS, and it's a reasonably recent version: 5.5, which was close to the lastest version of VMS back when I last worked with a VAX for an employer, back around 1992. :-) This far, I haven't noticed anything truly remarkable with regards to software, although at first glance, it looks like nothing is missing. Fortunately, someone installed kermit, so that will make things, such as installing TCP/IP, easier. :-) There appears to be a fair amount of audio software, which I think may all be for use with that DECVoice system; text to voice software, for example. Since I don't have a T1 telephone connection, alas, it appears that I'm not going to be able to use this DECVoice hardware, and the audio software on this machine. Also, there's a mention of SQL in one of the text files that I looked through, although I didn't notice any database software installed; of course, I don't know the names of databases using SQL for VAXen. DECnet is installed and apparently configured, so I guess this means that I can use my DEC terminal server with this machine... do I need to do anything other than connect the terminal server to the VAX and then use it? I know nothing about DECnet. Of course, there's still the little matter of no tape drive being installed in this system, which is not a good thing. I have a TK70 and a TK50, along with a TKQ70 board. -- Copyright (C) 2001 R. D. Davis The difference between humans & other animals: All Rights Reserved an unnatural belief that we're above Nature & rdd(a)rddavis.net 410-744-4900 her other creatures, using dogma to justify such http://www.rddavis.net beliefs and to justify much human cruelty.

24 years, 5 months

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Reading data from a CDC Hawk Drive

by kevin＠xpuppy.freeserve.co.uk

As part of an emulator project I need to read data from many CDC Hawk packs. I have a drive and I believe it is an SMD interface. The drive also seems to be known as a DD1600. Does anyone have any details on this drive? Two possible options occured to me:- 1. Obtain (?) an SMD controller card for a PC and try to access the drive using this - and an appropriate amount of C. 2. Use a QBUS SMD controller in my PDP11 and get at the data that way. Any thoughts gratefully received. (BTW The machine I am emulating is an old British minicomputer called the Molecular.) Kevin Murrell ------------- www.ps8computing.co.uk

24 years, 5 months

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IBM ROM BASIC or lack thereof

by acme_ent＠bellsouth.net

> > What's the deal with the BASIC in ROM on these machines? Any other early > > PeeCee's have this feature? > > It's standard Microsoft cassette BASIC. Similar to (say) TRS-80 CoCo > BASIC. > > The true-blue IBM PC. PC/XT (and therefore PortablePC), PC/AT, PCjr, etc > all have BASIC in ROM. I don't think it was ever licensed to clones, and > I don't think any clone company ever wrote a ROM BASIC from scratch. So > pretty much the only place you'll find it is in IBM machines. Tony, I think you are correct as I've never seen a clone mb with BASIC in ROM, but I *have* seen clone boards -- including early Pentium boards -- which would cough up "no rom basic" if they didn't find a bootable device. Oddly enough the text of this message is always displayed in 40-column low-res mode. Doesn't this suggest that part of the ROM BIOS code was "borrowed" from early IBM code? Glen 0/0

24 years, 5 months

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Archiving floppies?

by zaft＠azstarnet.com

Does anyone have any recommendations on software (preferably free) for archiving old DOS floppies? What I'd like to do is to be able to make disk images of all (okay, maybe just 'many') of the old DOS floppies I have so that if they disks get trashed or the bits fall off I can remake 'em. I'm assuming I'd probably be making these archives from a Windoze box although DOS or even FreeBSD or Linux is a possibility. Thanks in advance. GZ

24 years, 5 months

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Are office people really that, umm shall we say...slow?

by fernande＠internet1.net

I just went to a local computer show today. I was happy to find that a few vendors had components available from disassembled computers or whatever. I picked up a 3com 3C905-TX PCI ethernet card, an ATI Mach64 video card, and a very nice Sound Blaster 16, all used of course. The Mach64 had "Monitor" written in marker on the slot cover. Do office people really need to remind themselves where to plug the monitor in? I have also seen a 3.5" floppy drives marked "hard drive a:" and the 5.25" floppy, marked, "floppy drive b:". What's the deal? I also picked up a new AMD K6-II 500 to replace my IBM 6x86 233, and a nice new heatsink/fan for it too. Hopefully I'll have my re-made socket 7 setup, up and running Linux soon :-) Chad Fernandez Michigan, USA

24 years, 5 months

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"Early" 3.5" diskettes (was: Wired covers VCF east

by mbg＠world.std.com

Allison, I'll have to show you the machine... maybe you could identify the drive right off without having to open the case. For a preview, check out the wired.com article pictures... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

24 years, 5 months

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RS6000 7012-320H

by cmurillo＠emtelsa.multi.net.co

Today I came by an RS6000 7012-320H (Powerserver 320). On topic, since it was introduced in '91. It seems to have 16MB RAM, a SCSI card, an 800MB HD, 25MHZ cpu and a 8-port serial card. No framebuffer. There was an 8mm tape unit that came with it. Oh, and, >from what I can gather from the IBM web site, it is missing some sort of "ethernet riser card" which seems to provide the means to drive enet starting from a network header on the mainboard. I should be getting some of the terminals that were hooked to this beast. However, I have neither keys nor AIX install media. So I have several questions: 1) Which OS' (besides some old version of AIX) run on this box? Or, if I am stuck with AIX, in addition to praying that the HD is still alive, how could I break in and change the root password? 2) What exactly is this "ethernet riser card"? Do I have a network-less system? 3) Late last year, I posted a message to this list about some SIMMs that I grabbed off an AS400 system; they look like 72pin SIMMs but have a slightly different form factor and won't fit in a standard 72 pin socket. The thing is, they seem to fit the sockets in this system. And, that AS400 was equipped with exactly the same model of HD that this RS6000 has. So I am wondering if those 4MB SIMMS will fit this system, which is filled with 2MB SIMMS... carlos. -------------------------------------------------------------- Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org

24 years, 5 months

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Apple ][ disk controller state machine

by dhquebbeman＠theestopinalgroup.com

> Until I get my hands on a copy of the venerable "Beneath Apple Dos" > is there anyone who can point me to an online resource describing the > Apple ][ disk controller P6 ROM state machine? The exact uses > for the Q6 and Q7 switches ($C0EC-$C0EF)? Or would be willing to > summarize from the mighty tome for me? From: http://www.mac.linux-m68k.org/devel/iwm.php : ======================= : Accessing IWM Registers : ======================= : The IWM chip has several internal registers available to programs. : Access to these registers is controlled by the Q6 and Q7 switches. : : +=====+=====+=======================================+ : | Q6 | Q7 | Register | : +=====+=====+=======================================+ : | off | off | Read data register | : +-----+-----+---------------------------------------+ : | off | on | Read handshake register | : +-----+-----+---------------------------------------+ : | on | off | Read status register | : +-----+-----+---------------------------------------+ : | on | on | Write mode register (if drive is off) | : | | | data register (if drive is on) | : +-----+-----+---------------------------------------+ : : The mode register is a write-only register containing several flag bits : which control various features if the IWM. To access it, turn off the : drive (by accessing ENABLE), turn on Q6 and Q7, and write to any : odd-numbered address in the $C0E0...$C0EF range. hth, -dq

24 years, 5 months

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Amiga 3000 problem

by rachael_＠gmx.net

on 19-Sep-01 10:41:29, Willi Kusche wrote: >Hi! >On 19-Sep-01, Ethan Dicks wrote: >>I _think_ the Amiga 3000/16 had a 16Mhz 68881 and the A3000/25 >>had a 25Mhz 68882, but I could easily be mistaken. > I'm composing this message on an Amiga 3000 that had its motherboard >upgraded from 16 Mhz to 25 Mhz. Ever since the upgrade I occasionally get a >video crash that makes the screen unreadable. But, the system keeps running >OK. For example, if that video crash were to occur while I'm typing this >message, I've learned that hitting right-Amiga and 'S' will save the message >so I can finish the message after re-booting the A3000. Sounds like the two PAL ic on the left side, under any zorro cards you may have installed, they have a nasty habit of running hot, and makingen the screen unreadable. I changes mine and at the sametime removede the batteri for the RTC as it was leaking. Regards Jacob Dahl Pind -- CBM, Amiga,Vintage hardware collector Email: Rachael_(a)gmx.net url: http://rachael.dyndns.org

24 years, 5 months

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Squealing CRTs

by optimus＠canit.se

Heller to everyone and Tony. ;-) What do you do about a squealing CRT? I've got this nice terminal which is working, but it emits a high-pitched whine which is not only unpleasant and annoying, but quite scary, too. It feels as thoughit's going to blow in your face any minute. The terminal in question is a green-screen TECO VA120. -- En ligne avec Thor 2.6a. Ky?suke: Jag heter Kurre, Kurre Carlsson! Jag: Det heter du inte alls!

24 years, 5 months

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CBM8032 - wobbly screen

by avickers＠solutionengineers.com

Hi again folks, My US 8032 turned up today (yay!). Since I can't modify the transformer (unfortunately - it looks like the US one doesn't have dual primary taps like the UK one), I've swapped it out with the 240vac transformer from my other (still broken) 8032. This machine has a wobbly screen, just like the 8032-SK (which was broken, but I installed the working motherboard), the other 8032 (which was working, until I swapped the broken m/b), and the 3016. In fact, the only PET I've got which *doesn't* have a wobbly screen is the 2001. Well, it does wobble, but only a tiny bit. ISTR a discussion (mostly with Tony) about dried electrolytics maybe causing the problem. However, I spoke to the chap in the US who said that when the 8032 left America it had a rock-steady screen... Since I left the big cap in place, it can only be the transformer which is causing the wobble - can't it? I genuinely don't know. That's the only part I've swapped in the new 8032. Could a flakey transformer be making the screen wobble? How do transformers go flakey anyway, if indeed they *can* co flakey? Or is the US chap telling porkies? Thanks, again, in advance. -- Cheers, Ade. Be where it's at, B-Racing! http://b-racing.co.uk

24 years, 5 months

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Still looking

by dittman＠dittman.net

> I am still looking for the Digital Alpha 233 MHz 21066A CPU. I am > interested > in buying it or swapping it for the following Alpha hardware: > > 1x Digital Alpha 233 MHz 21064BB CPU > 1x Digital Alpha 266 MHz 21164AA CPU Both of these are faster than the 21066A CPU. Perhaps you should look for a motherboard for either of these processors instead of the 21066A CPU. -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

24 years, 5 months

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ZX81 kits (was Re: Keep or assemble???)

by acme_ent＠bellsouth.net

> > The ULA does a lot more than handle the display ;>) > > CPU clock generation (which would be useful). Address decoding (which I'd > want to modify if I was changing the amount of RAM). Very interesting -- how much RAM are you talking about adding that you have to modify the address decoding? > > Of course not ;>) But a ZX81 kit is still faster than starting from > > scratch. > > Is it? It's not going to take long to wire-wrap a clock circuit and > address decoder, and stick in the Z80. It depends _very much_ on how much > of the ZX81 you want to use... Which in turn depends on what the intended use of the finished device is. Since I want a "general purpose" computer the ROM BASIC functions are very convenient, and fast if called directly. Other applications of the Z80 would not need this code so a quickie Z80 board would be fine. > > Try desoldering the RF modulator from a ZX81 board ;>) > > Well, I had never tried to do it before, so I grabbed a ZX81, What, do you have a pile of these? > unscrewed > the case and attacked it with soldering iron and sucker. > > What's the catch? In the US versions which have 3 thin wires, they sometimes become brittle and break. Tony (and others), a question: in your opinion, which microprocessor was the most well-designed (even if not implemented)? Glen 0/0

24 years, 5 months

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Hardware races

by KenzieM＠sympatico.ca

On another list someone mentioned that a PDP11 ran at about the same speed as a 486-66. I don't have a 486-66 but do have a PDP11/34 in the garage so I suggested that if a 486-66 could be found we could have a race. I tested the capacitors on the weekend and they were OK, still need to test the RL01 drives and get them hooked up. >From the cables in the cabinet and the terminator on one of the drives I'm guessing that they are daisy chained. A few questions remain. What would be the best way to test the Power supply it is currently off the chassis, does it need to be connected for testing? Any suggestions for a fair race? Recent additions: Unisys PW2 (Unisys ICON NETWORK), Microcom (apple clone), SHARP PC4500 Collector of Vintage Computers (www.ncf.ca/~ba600)

24 years, 5 months

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IBM 4965

by Diff＠Mac.com

Hello, I have been offered a rather large collection of machines, including an IBM PC with the original monitor, and an IBM 4965 with an 8" floppy drive. The 4965 is mounted in a large white rack, with a power supply mounted at the bottom, and the cover has been removed from the power supply, Anyone know anything about these machines? It looks as though all the original disks and documentation is there, but I am wondering whether its worth my time to clean this up. Zach

24 years, 5 months

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VAX 4000 Power Cord (BA440)

by dittman＠dittman.net

I remember a couple of months ago there was discussion on the proper cable for a BA440 power supply (normal North American three prong power cord but with a notch where it plugs in to the power supply). Was there a consensus on the designation (and any place in the US that sell them)? -- Eric Dittman dittman(a)dittman.net

24 years, 6 months

9
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Bad bad DECstation

by optimus＠canit.se

Our DECstation 3100 has been in a sad state recently. Both the monitor (that old monochrome thing without a stand which was used with the VS2000 amongst others) and the keyboard (LK201) had given up the gist (the monitor would just make a flickery sound, without the CRT coming alive, the keyboard didn't blink and the console would blink "??" when it reached test 3). I plugged in a Nokia monitor, which worked, if you can live with the green picture, and another LK201. That worked for a while, but when I managed to boot it (NFS wasn't so cooperative this day), and reached X, the mouse just stopped moving after a while. I rebooted it, and suddenly this keyboard had died as well. What the hell is going on? Is it possible to save the LK201s? We're running short of DEC keyboards as it is, and we certainly don't need this. -- En ligne avec Thor 2.6a. If the designers of X-Windows built cars, there would be no fewer than five steering wheels hidden about the cockpit, none of which followed the same principles -- but you'd be able to shift gears with your car stereo. Useful feature, that. - Marus J. Ranum, Digital Equipment Corporation

24 years, 6 months

4
6
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8080 vs. 8080A

by ajp166＠bellatlantic.net

Track the clock through the logic... there is a divide by 2 in there. Also the 9080 250ns part was late in the game and hard to find. If you want an 8080 that was really fast use a 8085-5 (5mhz) or the later 80c85-6(6mhz). the latter was a nice part as it was CMOS. I still have a potload of 8080s and 8085s and my design favorite for small systems is the 8085 over the Z80. Allison -----Original Message----- From: Richard Erlacher <edick(a)idcomm.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, September 30, 2001 8:23 PM Subject: Re: 8080 vs. 8080A >Well, Allison, it appears you're right. The AMD 9080 was the one with the 250ns >clock (4 MHz) period, now that I've looked a couple of references. Thanks for >clearing that up. > >However, that doesn't explain what's going on in my iSBC8020-4's. I'll have to >figure that one out. > >Dick >----- Original Message ----- >From: "ajp166" <ajp166(a)bellatlantic.net> >To: <classiccmp(a)classiccmp.org> >Sent: Sunday, September 30, 2001 5:12 PM >Subject: Re: 8080 vs. 8080A > > >> no, it was 2mhz. >> >> using 8224 the usual crystal was 18.435 (2.0483333*9). >> there was a -1. -2 and -3 version of the part but the fastest was 3mhz. >> >> I used to sell upD8080AF for NEC and I had to know my competition. >> >> Allison >> >> -----Original Message----- >> From: Richard Erlacher <edick(a)idcomm.com> >> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> >> Date: Sunday, September 30, 2001 6:23 PM >> Subject: Re: 8080 vs. 8080A >> >> >> >BTW, the 8080 was a 2.5 MHz part, wasn't it? I've got a couple Intel >> app-notes >> >where they generate a baud-rate clock from 24.576 MHz and generate the >> CPU clock >> >from that, at 2.4576 MHz for the CPU. That's on an i8080-2. >> > >> >Dick >> > >> >----- Original Message ----- >> >From: "ajp166" <ajp166(a)bellatlantic.net> >> >To: <classiccmp(a)classiccmp.org> >> >Sent: Sunday, September 30, 2001 2:31 PM >> >Subject: Re: 8080 vs. 8080A >> > >> > >> >> Wrong! >> >> >> >> The I8080A is AS fast as the i8080. the i8080A-1 is faster but not >> twice >> >> as the fastest 8080[A] was only 3mhz and hte standard part was 2mhz. >> >> >> >> Allison >> >> >> >> -----Original Message----- >> >> From: John Galt <gmphillips(a)earthlink.net> >> >> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> >> >> Date: Sunday, September 30, 2001 3:57 PM >> >> Subject: Re: 8080 vs. 8080A >> >> >> >> >> >> >"The i8080A is essentially twice as fast as the >> >> > standard i8080 and COULD be used more easily with low-power logic >> since >> >> its >> >> >demands aren't as stringent". >> >> > >> >> >Ok, that's a good start. >> >> > >> >> >But, I don't think "low power" TTL (transistor transistor logic) had >> >> >anything to do with the complexity of the code being executed on the >> >> chip. >> >> >True? I had assumed >> >> >that the references to the 8080 only being compatible >> >> >with "low-power TTL" and the 8080A being compatible >> >> >with "standard TTL" had something to do with the support chips (Ram, >> >> clock, >> >> >etc) that could be used with the 8080 vs. the 8080A. >> >> > >> >> >Since I'm new to this mail list, let me explain why I would >> >> >show up here and ask such a question to begin with. >> >> > >> >> >I'm a chip collector. I am trying to document the differences >> between >> >> the >> >> >different early Intel microprocessors. Not worried about massive >> >> detail, >> >> >just the major differences (PMOS, vs. NMOS, vs. >> >> >HMOS, clock speed, transistor count, etc). >> >> > >> >> >The only microprocessor that I don't have a good handle >> >> >on is the 8080 and the difference between the 8080 and 8080A. >> >> > >> >> >I also know that the 8080 was introduced sometime >> >> >around April 1974. I have not been able to find an >> >> >introduction date for the 8080A. Was it introduced at >> >> >the same time? Does anyone know? >> >> > >> >> >I also need an Intel C8080 or C8080-8 for my >> >> >collection. If you have one, I want it. I have been looking >> >> >for one for months and have not been able to find one. >> >> >If you have either of these chips in good condition >> >> >(no desoldered parts wanted), I'm offering 400.00 >> >> >for the C8080-8 and 500.00 for a C8080. >> >> > >> >> >If you need a replacement for the C8080 or C8080-8 you sell me, I'll >> >> GIVE >> >> >you a D8080A free as part of the >> >> >deal. >> >> > >> >> >----- Original Message ----- >> >> >From: "Richard Erlacher" <edick(a)idcomm.com> >> >> >To: <classiccmp(a)classiccmp.org> >> >> >Sent: Sunday, September 30, 2001 1:21 PM >> >> >Subject: Re: 8080 vs. 8080A >> >> > >> >> > >> >> >> This makes no sense at all, though it may be because I'm >> >> misinterpreting >> >> >the way >> >> >> in which you've put it. >> >> >> >> >> >> I have Intel boards that come in versions with the i8080 and also, >> >> >> optionally,with the i8080A, and, aside from the clock frequency and >> >> memory >> >> >> access times, they're identical. The i8080A is essentially twice >> as >> >> fast >> >> >as the >> >> >> standard i8080 and COULD be used more easily with low-power logic >> >> since >> >> >its >> >> >> demands aren't as stringent. >> >> >> >> >> >> The i8080A will, AFAIK, replace the i8080 in all applications >> without >> >> ill >> >> >> effects. >> >> >> >> >> >> BTW, please turn off "rich-text" mode in your email editor when you >> >> >compose >> >> >> messages for this group, as some folks' mail readers can't >> interpret >> >> the >> >> >> rich-text/HTML format. >> >> >> >> >> >> Dick >> >> >> ++++++++++++++++++++++++++++++++++++++ >> >> >> ----- Original Message ----- >> >> >> From: John Galt >> >> >> To: classiccmp(a)classiccmp.org >> >> >> Sent: Sunday, September 30, 2001 10:17 AM >> >> >> Subject: 8080 vs. 8080A >> >> >> >> >> >> >> >> >> Can anyone here describe the technical differences between >> >> >> an Intel 8080 and Intel 8080A CPU? >> >> >> >> >> >> The ONLY ref. I have been able to find seems to indicate that there >> >> was a >> >> >bug in >> >> >> the 8080 and as a result it would only work with low power TTL? >> >> >> >> >> >> The problem was fixed in the 8080A and it would work with standard >> >> TTL? >> >> >> >> >> >> Does this make sense to anyone? >> >> >> >> >> >> Could anyone put this into laymans terms for me? >> >> >> >> >> >> Thanks, >> >> >> >> >> >> George Phillips - gmphillips(a)earthlink.net >> >> >> >> >> > >> >> >> >> >> > >> >> > >

24 years, 6 months

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FDDI Cards

by vance＠ikickass.org

Anyone know where I might be able to find DEC DEFPA's, DEC DEFTA's, IBM FDDI/MC's and thing of the like? Peace... Sridhar

24 years, 6 months

2
2
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Odd VT100 question

by healyzh＠aracnet.com

OK, I'm thinking of doing a wierd mod on a VT100, just how much room is inside one of them? I need room for a 7 1/2" x 9" x 2 1/2" board (the 2 1/2" is thanks to the heatsink and RAM), and would also like to be able to fit in a smallish 250W PS (3 1/2" x 5 1/2" x 6"), and a 3 1/2" HD. I've got 2 or 3 VT100's, but they're so buried it's going to take a lot of work to get to them so was hoping to get an idea if there is room first. Basically I'm trying to build a PDP-10 into a VT100 by using an Intel D810EMO MicroATX board. Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast | | | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | PDP-10 Emulation and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

24 years, 6 months

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FT: Alpha Architecture Docs

by cmcmanis＠mcmanis.com

The Alpha was started by DEC in 1988 as a replacement for the VAX, it extends the address space to 64 bits and switches from a CISC architecture to a RISC architecture. I've got a copy the Alpha Architecture Reference Manual (AARM) and the Alpha Architecture Handbook (AAH) which combined give you everything you need to know about the Alpha. They're extras. I'd like to offer them in trade to anyone who has EITHER: KA640 Technical Manual KA680 Technical Manual Also published by Digital. --Chuck

24 years, 6 months

2
1
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IBM ROM BASIC or lack thereof

by acme_ent＠bellsouth.net

Tony Duell wrote: > My guess is that clones used the same method. They tried to boot from the > hard disk and floppy disk and then call INT 18h. Since there is no ROM > basic, INT 18h points to a little bit of code that displays the No ROM > BASIC message (as far as I can see this message is not in the IBM ROMs) > and then halts the CPU. This was the point to my original question: why would clone makers go to the trouble of displaying the message and then halting the system, instead of just *halting the system*? (Unless they were using stolen code.) Just doesn't quite make sense . . . Glen 0/0

24 years, 6 months

3
2
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Boot Disk Needed

by nkloudon＠webpathway.com

I am in need of a 5 1/4" floppy boot disk for an AST Premium 386/25 running DOS 6.22. Any help or advice would be appreciated. - Kent Loudon, Somerville NJ

24 years, 6 months

2
1
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IBM ROM BASIC or lack thereof

by mcguire＠neurotica.com

On September 30, Fred Cisin (XenoSoft) wrote: > OB_trivia: 1) what did GWBASIC stand for? Years ago, I heard somewhere that it stood for "Gee Whiz" BASIC, though I've no idea why or even if this is accurate. -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

2
1
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Osborne/Kaypro disk help needed

by acme_ent＠bellsouth.net

I snagged a very clean Osborne at the Junk Fest today but no disks. I thought I could use 22disk on my Wintel box but then found out the Oz is single density and this Wintel box won't write single-density. Okay, so I can use MFDISK10 on my Kaypro 10 to generate a bootable Oz, disk right? Well, MFDISK10 is missing in action. Hmm. So I found and downloaded MFDISK10 from the 'net, put it on a Kaypro disk, ran the program, and got as far as "use the arrow keys to move around," but the arrow keys do not move the cursor, so I am unable to select a disk type from the menu. Hmm. Broken arrow keys? So, I fired up WordStar and the arrow keys work fine in WS. So, I need help in either: 1 -- finding out why the arrow keys don't work in MFDISK10 or 2 -- getting some other program to run on my Kaypro which will create Oz disks or 3 -- obtaining some Osborne disks (last choice) TIA, Glen 0/0

24 years, 6 months

2
1
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Bad bad DECstation

by mcguire＠neurotica.com

On October 1, Iggy Drougge wrote: > OTOH, the main strength of the DECstation is that it's a graphical > workstation. Running it through a terminal would mean losing the graphics, > and running it then wouldn't make much sense (it might at home, but we've got > enough machines without any proper uses at the UG anyway =). Uhh, what? No way. *A* strength of a DECstation is that it's a graphical workstation. But it's certainly quite useful as a headless machine as well. I'm not running any anymore, but as recently as a year ago I had a few headless DECstations doing a great deal of real work. -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

2
1
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Unsing other Tapedrive instead of TK50

by lothar.felten＠gmx.net

hello, i?ve got a VaxStation M38 with harddisk, but is has no drives. the NetBSD-Install-HowTo says how to make boot-tapes (TK50). i could make a boot tape with my (ix86) NetBSD computer, but i have no SCSI-TK50 tapedrive. could i use an old qic tapedrive (also scsi, up to 150Mb)? i also have an PDP-11/73, this one has two harddisks (RD54 maybe?), 4 megs of ram, a TK50 drive (the connector looks like scsi, but in the drive only few pins are connected, so i suppose this is not scsi) and 2 huge RL02. there is no system on it. on a wbsite i found BSD 2.11 should run on this pdp-11, but is it free? where can i get it? and again, how to get the image on TK50 Tape without any SCSI-TK50 drive? where could i get a scsi-TK50 drive? many questions... maybe someone can help lothar

24 years, 6 months

4
3
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8080 vs. 8080A

by pete＠dunnington.u-net.com

On Sep 30, 15:43, Richard Erlacher wrote: > BTW, the 8080 was a 2.5 MHz part, wasn't it? I've got a couple Intel app-notes > where they generate a baud-rate clock from 24.576 MHz and generate the CPU clock > from that, at 2.4576 MHz for the CPU. That's on an i8080-2. Sure you're not thinking of a Z80? The standard speed for the original Z80 parts was 2.5MHz (4MHz for Z80A and 6MHz for Z80H). -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

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2
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Epson QX-10

by kreation＠juno.com

Hi All; For those poor mis informed folk -- the Epson QX-10 was not a laptop. Many of the common features that are in use in keyboards today first appeared on the OX-10 (Help key, Undo key and others). Jerry Parnell (held stock in IBM ---- ick!!!!!!) was a major influence in the demise of the QX series. He spent 3 days with Chris Ratowski to review to the Valdocs III Integrated Software package. He saw a beta version with some bugs in it. In the course of those three days he kept saying what a great piece of software Valdocs was. Chris explained several times that it was a beta version and not quite ready for release. Jerry was at that time a reviewer for the three major computer mags (Personal Computing, Byte Mag. and Popular Computing). Epson was just approaching the big time with 100,000 QX-10s sold in the USA and Chris was countering on Jerry's reviews as a big market boast. Will Jerry released these reviews in all three mags at the same time and the market for Epson QX-10 dropped over night. He never said the version he saw was beta and proceeded to rip the QX-10 apart with very much erroneous information; it was obvious that he hated anything that wasn't IBM (esp if it was better which the Epson was). It was ten times the computer. I know much more about if any are interested. I have a QX-10 complete that I bought in 1986 or 1987 (don't remember). It still works somewhat. I the Valdocs software, CPM 80 and much other software. The reset button was by passed as it failed and the keyboard cord has been spliced together. It also has a 300 baud modem and the beta version of an optical mouse which works with Val Draw only. I was a beta tester for the Epson QX-10. I know first hand most of its history and what came with it. I had a complete collection of all mags written for it. Don't know what I did with them. I am interested in selling it if some one wants it. It also needs a new clock battery (nicad). I am not sure the floppies are still readable????????????? doug kreation(a)juno.com

24 years, 6 months

4
3
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8080 vs. 8080A

by ajp166＠bellatlantic.net

From: Pete Turnbull <pete(a)dunnington.u-net.com> >> I used to sell upD8080AF for NEC and I had to know my competition. > >Ah, then you'll know what the difference(s) was/were. While looking up >8080A and 8080 (except all my 1976 and 1979 Intel Data Books say is that >they're functionally and electrically compatible) I discovered that NEC >made two versions, both called 8080A, but one with some enhancements. I >assume that this was rather like the idea they used in the V20. The note >said that 8080A's from authorised second-sources were competely code >compatible but the enhanced NEC version was not, and wouldn't always run >certain Intel code. What was the difference, and what made it not run >certain programs? Ah no, not a V20 thing. The first version of the NEC 8080A was not fully compatable at the hardware level. It was the interrupt/hold thing. It origninated with the fact that NEC did not use intel masks but reverse engineered from working intel parts. The D8080AF was fully compatable with intel 8080A, and I mean fully. FYI: only one part was 8080AF the other was 8080A. The program error was mostly invisible but impacted those programs that used both interrupts and DMA. The specifics are centered about the hold state and the DAD instruction, Intel treated it like a write and NEC 8080A treated it as read. generally speaking the halt/hold/interrupt interactions and timing made designing complex systems much more difficult than would first appear. It was a reason for the rapid adoption of 8085 and z80 even though they were more expensive early on. Allison

24 years, 6 months

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0
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Weekend finds and help needed

by dan＠ekoan.com

This weekend was good for finding vintage HP items, but I'm looking for additional documentation and parts: 1. HP 9836C Picked up the CPU and monitor, but there were no manuals or media. The machine boots and displays: 9836C 2250A02013 Copyright 1982, Hewlett-Packard Company All Rights Reserved BOOTROM 3.0 Keyboard Color Graphics 2 Flexible Discs HP-IB HP 98628- at 20 917344 Bytes SEARCHING FOR A SYSTEM (ENTER to Pause) RESET To Power-Up At which point it hangs, presumably waiting for an operating system. Any leads on documentation, operating systems, and additional options for this computer would be most welcome. 2. HP 98241-67901 I/O Extender Appears to be for the 9825 series and has a test point for each of the interface lines. 3. HP ROM Drawers These were found loose in a parts bin and they appear to be ROM drawers for the HP 9825 series of desktop computers. I have three drawers, one with six slots (all of 'em empty) and two drawers with four slots. Each of the four-slot drawers has a single ROM labeled 98338A Assembly Execution 1 (the other slots are empty). Pictures can be found on my "Items Needing Help" web page at www.decodesystems.com/help-wanted/index.html . Again, any leads on documentation or additional ROMs for these drawers would be appreciated. Thanks! Cheers, Dan www.decodesystems.com

24 years, 6 months

3
2
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HDS(?) ViewStation Monitor

by millerbj＠umich.edu

Okay, so I've been sitting here trolling the newsgroup ever since my last post. I've read almost every post that drops into my mail-box - a lot of questions I can't answer. Anyway, I'd asked about an IBM PowerStation 530, and got a lot of responces, and eventually got a cable (Thanks Peter, your check's going in the mail on Monday) to make the 3 micro-BNC in DB housing output into a 3 BNC RGB hookup. I went to the local place to look at crap, and found only one monitor that has the three BNC hookups - it's an HDS ViewStation, with no other real info on it... Will this work with the system? Anyone heard of this thing before. Also, it's $50 - is that really a reasonable price or should I try to talk him down? If it helps, the diagrams next to the RGB hookups on the back of the monitor showed a vertical arrow in next to the R and a horizontal one next to the B, and nothing next to the green. This would lead me to believe that it syncs vertical on Red and horizontal on Blue, which obviously won't work, but I just want to make sure. Thanks again for any and all help. If this monitor won't work, I'm gonna go look again and see what sort of 5 BNC models I can find... I was told some will work (Thanks Bennett). Blair

24 years, 6 months

4
3
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Stupid question that's been annoying me

by pete＠dunnington.u-net.com

On Sep 30, 14:41, Derek Peschel wrote: > On Sun, Sep 30, 2001 at 01:38:13PM +0000, Pete Turnbull wrote: > > confusing, try comparing the carry flags implemented in a Z80 and a 6502 > > (they do different things for subtractions!). > > And (on the 6502) if you want to get a given result using addition vs. > subraction, the carry flag must be set differently. i.e., if you have > > LDA #$FF LDA #$FF > ADC #$01 vs. SBC #$FF > > and you want A to end up with $00, then you must put before the LDA: > > CLC vs. SEC > > I might never have known this except that I wanted to check my post > before posting it. Yes, I found that confusing when I got my first 6502 machine (I had a Z80 before that). > > The other problem you have is with the overflow. It's not a problem with > > signed vs unsigned numbers as some people have implied, it's with the order > > Well, as one of those people I may as well ask you how much of my post is > corect and how much is junk. I don't think much was junk :-) You just didn't quite solve the puzzle. You suggested the flags might change if you change the system (from signed to unsigned, I think you meant), and they don't. In general, a processor doesn't know whether you're thinking of signed or unsigned numbers when you write the code. However, the meanings may change. Normally you don't pay much attention to the carry for signed arithmetic, it's the overflow that tells you useful things like whether the sign bit is correct or the answer is meaningful. You still use the carry for multi-byte arithmetic, of course, but it's automagically correct and you don't have to think about it (other than a preliminary SEC or CCF or whatever). On the other hand, you don't normally have any interest at all in the overflow for unsigned arithmetic, though it's still there; it just doesn't mean anything useful. You also suggested the flags might change between addition and subtraction, and in some processors, yes they do. Some processors complement the carry flag after a subtraction (ones that don't want a SEC before a subtraction, for example :-)) The example you chose was perhaps what confused you (1--2= 3 1+-2=-1); the problem being that -2 is its own 2's-complement in a 2-bit signed system (0 is the other one that causes trouble, this time with the carry). You'd get the same problem with -8 in a 4-bit system, or -128 in an 8-bit system. -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

1
0
0 0

Stupid question that's been annoying me

by pete＠dunnington.u-net.com

On Sep 30, 13:54, Cameron Kaiser wrote: > > Maybe part of the confusion arises because many processors (including the > > 8080) complement the carry flag at the end of a subtraction, so that it can > > be used directly as a "borrow" flag in multibyte subtractions. Others > > (like the 6502) don't do that. > > I'm not sure what you mean by this, but on my C128, > > 1300 ad 01 04 lda $0401 > 1303 38 sec That's my point: you have to SEC first. You would clear it on most other processors. Also, after a subtraction, the 6502 sets the carry to 0 if a borrow was necessary, or to 1 if not; a 6800, 8080, or Z80 does the opposite. -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

1
0
0 0

8080 vs. 8080A

by pete＠dunnington.u-net.com

On Sep 30, 19:12, ajp166 wrote: > no, it was 2mhz. > > using 8224 the usual crystal was 18.435 (2.0483333*9). > there was a -1. -2 and -3 version of the part but the fastest was 3mhz. > > I used to sell upD8080AF for NEC and I had to know my competition. Ah, then you'll know what the difference(s) was/were. While looking up 8080A and 8080 (except all my 1976 and 1979 Intel Data Books say is that they're functionally and electrically compatible) I discovered that NEC made two versions, both called 8080A, but one with some enhancements. I assume that this was rather like the idea they used in the V20. The note said that 8080A's from authorised second-sources were competely code compatible but the enhanced NEC version was not, and wouldn't always run certain Intel code. What was the difference, and what made it not run certain programs? -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

1
0
0 0

8080 vs. 8080A

by ajp166＠bellatlantic.net

no, it was 2mhz. using 8224 the usual crystal was 18.435 (2.0483333*9). there was a -1. -2 and -3 version of the part but the fastest was 3mhz. I used to sell upD8080AF for NEC and I had to know my competition. Allison -----Original Message----- From: Richard Erlacher <edick(a)idcomm.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, September 30, 2001 6:23 PM Subject: Re: 8080 vs. 8080A >BTW, the 8080 was a 2.5 MHz part, wasn't it? I've got a couple Intel app-notes >where they generate a baud-rate clock from 24.576 MHz and generate the CPU clock >from that, at 2.4576 MHz for the CPU. That's on an i8080-2. > >Dick > >----- Original Message ----- >From: "ajp166" <ajp166(a)bellatlantic.net> >To: <classiccmp(a)classiccmp.org> >Sent: Sunday, September 30, 2001 2:31 PM >Subject: Re: 8080 vs. 8080A > > >> Wrong! >> >> The I8080A is AS fast as the i8080. the i8080A-1 is faster but not twice >> as the fastest 8080[A] was only 3mhz and hte standard part was 2mhz. >> >> Allison >> >> -----Original Message----- >> From: John Galt <gmphillips(a)earthlink.net> >> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> >> Date: Sunday, September 30, 2001 3:57 PM >> Subject: Re: 8080 vs. 8080A >> >> >> >"The i8080A is essentially twice as fast as the >> > standard i8080 and COULD be used more easily with low-power logic since >> its >> >demands aren't as stringent". >> > >> >Ok, that's a good start. >> > >> >But, I don't think "low power" TTL (transistor transistor logic) had >> >anything to do with the complexity of the code being executed on the >> chip. >> >True? I had assumed >> >that the references to the 8080 only being compatible >> >with "low-power TTL" and the 8080A being compatible >> >with "standard TTL" had something to do with the support chips (Ram, >> clock, >> >etc) that could be used with the 8080 vs. the 8080A. >> > >> >Since I'm new to this mail list, let me explain why I would >> >show up here and ask such a question to begin with. >> > >> >I'm a chip collector. I am trying to document the differences between >> the >> >different early Intel microprocessors. Not worried about massive >> detail, >> >just the major differences (PMOS, vs. NMOS, vs. >> >HMOS, clock speed, transistor count, etc). >> > >> >The only microprocessor that I don't have a good handle >> >on is the 8080 and the difference between the 8080 and 8080A. >> > >> >I also know that the 8080 was introduced sometime >> >around April 1974. I have not been able to find an >> >introduction date for the 8080A. Was it introduced at >> >the same time? Does anyone know? >> > >> >I also need an Intel C8080 or C8080-8 for my >> >collection. If you have one, I want it. I have been looking >> >for one for months and have not been able to find one. >> >If you have either of these chips in good condition >> >(no desoldered parts wanted), I'm offering 400.00 >> >for the C8080-8 and 500.00 for a C8080. >> > >> >If you need a replacement for the C8080 or C8080-8 you sell me, I'll >> GIVE >> >you a D8080A free as part of the >> >deal. >> > >> >----- Original Message ----- >> >From: "Richard Erlacher" <edick(a)idcomm.com> >> >To: <classiccmp(a)classiccmp.org> >> >Sent: Sunday, September 30, 2001 1:21 PM >> >Subject: Re: 8080 vs. 8080A >> > >> > >> >> This makes no sense at all, though it may be because I'm >> misinterpreting >> >the way >> >> in which you've put it. >> >> >> >> I have Intel boards that come in versions with the i8080 and also, >> >> optionally,with the i8080A, and, aside from the clock frequency and >> memory >> >> access times, they're identical. The i8080A is essentially twice as >> fast >> >as the >> >> standard i8080 and COULD be used more easily with low-power logic >> since >> >its >> >> demands aren't as stringent. >> >> >> >> The i8080A will, AFAIK, replace the i8080 in all applications without >> ill >> >> effects. >> >> >> >> BTW, please turn off "rich-text" mode in your email editor when you >> >compose >> >> messages for this group, as some folks' mail readers can't interpret >> the >> >> rich-text/HTML format. >> >> >> >> Dick >> >> ++++++++++++++++++++++++++++++++++++++ >> >> ----- Original Message ----- >> >> From: John Galt >> >> To: classiccmp(a)classiccmp.org >> >> Sent: Sunday, September 30, 2001 10:17 AM >> >> Subject: 8080 vs. 8080A >> >> >> >> >> >> Can anyone here describe the technical differences between >> >> an Intel 8080 and Intel 8080A CPU? >> >> >> >> The ONLY ref. I have been able to find seems to indicate that there >> was a >> >bug in >> >> the 8080 and as a result it would only work with low power TTL? >> >> >> >> The problem was fixed in the 8080A and it would work with standard >> TTL? >> >> >> >> Does this make sense to anyone? >> >> >> >> Could anyone put this into laymans terms for me? >> >> >> >> Thanks, >> >> >> >> George Phillips - gmphillips(a)earthlink.net >> >> >> > >> >> >

24 years, 6 months

2
1
0 0

8080 vs. 8080A

by gmphillips＠earthlink.net

Can anyone here describe the technical differences between an Intel 8080 and Intel 8080A CPU? The ONLY ref. I have been able to find seems to indicate that there was a bug in the 8080 and as a result it would only work with low power TTL? The problem was fixed in the 8080A and it would work with standard TTL? Does this make sense to anyone? Could anyone put this into laymans terms for me? Thanks, George Phillips - gmphillips(a)earthlink.net

24 years, 6 months

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8080 vs. 8080A

by ajp166＠bellatlantic.net

That agrees with my 1976 and 1978 intel data books. Allison -----Original Message----- From: Michael Holley <swtpc6800(a)home.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, September 30, 2001 7:02 PM Subject: Re: 8080 vs. 8080A >Intel did not refer to clock frequency but to Instruction Cycle to indicate >the speed of the chip. From Intel Component Data Catalog 1978 page 11-11 > >8080A 2 us >8080A-1 1.3 us >8080A-2 1.5 us > >My SDK-80 Users Guide has schematics dated July 1975 and show an 8080A. > >----------------------------------------------- >Michael Holley >holley(a)hyperlynx.com >----------------------------------------------- > >

24 years, 6 months

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8080 vs. 8080A

by ajp166＠bellatlantic.net

Nope, the clock you see was divided by 2. the board had two clocks one provided the 2mhz 2phase 12V clock for the 8080 the other was for other clocked parts. Allison -----Original Message----- From: Richard Erlacher <edick(a)idcomm.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, September 30, 2001 6:15 PM Subject: Re: 8080 vs. 8080A >The half-dozen or so I8020/4 boards I have all have i8080A CPU's in them, and >each is clocked at 4.(something very small) MHz, IIRC. Are you saying that >Intel ran these >1 MHz above spec? I've also seen numerous applications in >which they were driven at the color burst frequency from some harmonic of that. > >Dick > >----- Original Message ----- >From: "ajp166" <ajp166(a)bellatlantic.net> >To: <classiccmp(a)classiccmp.org> >Sent: Sunday, September 30, 2001 2:31 PM >Subject: Re: 8080 vs. 8080A > > >> Wrong! >> >> The I8080A is AS fast as the i8080. the i8080A-1 is faster but not twice >> as the fastest 8080[A] was only 3mhz and hte standard part was 2mhz. >> >> Allison >> >> -----Original Message----- >> From: John Galt <gmphillips(a)earthlink.net> >> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> >> Date: Sunday, September 30, 2001 3:57 PM >> Subject: Re: 8080 vs. 8080A >> >> >> >"The i8080A is essentially twice as fast as the >> > standard i8080 and COULD be used more easily with low-power logic since >> its >> >demands aren't as stringent". >> > >> >Ok, that's a good start. >> > >> >But, I don't think "low power" TTL (transistor transistor logic) had >> >anything to do with the complexity of the code being executed on the >> chip. >> >True? I had assumed >> >that the references to the 8080 only being compatible >> >with "low-power TTL" and the 8080A being compatible >> >with "standard TTL" had something to do with the support chips (Ram, >> clock, >> >etc) that could be used with the 8080 vs. the 8080A. >> > >> >Since I'm new to this mail list, let me explain why I would >> >show up here and ask such a question to begin with. >> > >> >I'm a chip collector. I am trying to document the differences between >> the >> >different early Intel microprocessors. Not worried about massive >> detail, >> >just the major differences (PMOS, vs. NMOS, vs. >> >HMOS, clock speed, transistor count, etc). >> > >> >The only microprocessor that I don't have a good handle >> >on is the 8080 and the difference between the 8080 and 8080A. >> > >> >I also know that the 8080 was introduced sometime >> >around April 1974. I have not been able to find an >> >introduction date for the 8080A. Was it introduced at >> >the same time? Does anyone know? >> > >> >I also need an Intel C8080 or C8080-8 for my >> >collection. If you have one, I want it. I have been looking >> >for one for months and have not been able to find one. >> >If you have either of these chips in good condition >> >(no desoldered parts wanted), I'm offering 400.00 >> >for the C8080-8 and 500.00 for a C8080. >> > >> >If you need a replacement for the C8080 or C8080-8 you sell me, I'll >> GIVE >> >you a D8080A free as part of the >> >deal. >> > >> >----- Original Message ----- >> >From: "Richard Erlacher" <edick(a)idcomm.com> >> >To: <classiccmp(a)classiccmp.org> >> >Sent: Sunday, September 30, 2001 1:21 PM >> >Subject: Re: 8080 vs. 8080A >> > >> > >> >> This makes no sense at all, though it may be because I'm >> misinterpreting >> >the way >> >> in which you've put it. >> >> >> >> I have Intel boards that come in versions with the i8080 and also, >> >> optionally,with the i8080A, and, aside from the clock frequency and >> memory >> >> access times, they're identical. The i8080A is essentially twice as >> fast >> >as the >> >> standard i8080 and COULD be used more easily with low-power logic >> since >> >its >> >> demands aren't as stringent. >> >> >> >> The i8080A will, AFAIK, replace the i8080 in all applications without >> ill >> >> effects. >> >> >> >> BTW, please turn off "rich-text" mode in your email editor when you >> >compose >> >> messages for this group, as some folks' mail readers can't interpret >> the >> >> rich-text/HTML format. >> >> >> >> Dick >> >> ++++++++++++++++++++++++++++++++++++++ >> >> ----- Original Message ----- >> >> From: John Galt >> >> To: classiccmp(a)classiccmp.org >> >> Sent: Sunday, September 30, 2001 10:17 AM >> >> Subject: 8080 vs. 8080A >> >> >> >> >> >> Can anyone here describe the technical differences between >> >> an Intel 8080 and Intel 8080A CPU? >> >> >> >> The ONLY ref. I have been able to find seems to indicate that there >> was a >> >bug in >> >> the 8080 and as a result it would only work with low power TTL? >> >> >> >> The problem was fixed in the 8080A and it would work with standard >> TTL? >> >> >> >> Does this make sense to anyone? >> >> >> >> Could anyone put this into laymans terms for me? >> >> >> >> Thanks, >> >> >> >> George Phillips - gmphillips(a)earthlink.net >> >> >> > >> >> >

24 years, 6 months

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Stupid question that's been annoying me

by pete＠dunnington.u-net.com

On Sep 29, 23:32, Jeffrey S. Sharp wrote: > Yes, I'm actually going to ask a question about two's complement > arithmetic! I feel quite stupid for mailing this, but I just can't figure > it out. And believe it or not, it really does have something to do with > classic computing. All right, here goes... > > While I was in class Thursday [...] I created the following table: [ snip ] > Note that the C and V flags behave differently in each half. This is very > disturbing, since I'm fairly certain that subtraction is implemented in > many processors as adding a negated subtrahend (ergo, I should see no > difference in the flags). What have I done wrong in my table? Firstly, you're assuming (on the left) that "carry" is the same as "borrow". Wrong! If you are subtracting, working the columns right-to-left, a borrow from one column to the previous (on the right) is balanced by adding the borrowed digit back to the subtrahend, so it gets subtracted from the result, not added. This is the opposite of a carry. That's why most of the "carry" flags you show in the left side of the table are incorrect; they're actually "borrow" flags. If you think this is confusing, try comparing the carry flags implemented in a Z80 and a 6502 (they do different things for subtractions!). The other problem you have is with the overflow. It's not a problem with signed vs unsigned numbers as some people have implied, it's with the order you do things in. I assume you're setting the V (oVerflow) as the XOR of the carry into the MSB and the carry out of the MSB. Well, this is true, but for it to work with pathological cases you don't do the full two's complement process before the addition, but do it at the same time. One of your cases is Subtraction Equivalent Addition AA-BB=CC CZSV AA+BB=CC CZSV 01 10 11 x.xx 01 10 11 ..x. The difficulty is that binary 10 is its own complement. However, you'll get the right answer if you say that "A - B" is the same as "A + inv(B) + 1" where "inv(B)" is the ones-complement of B. "inv(10)" is "01". Now add "01" + "01" + "1" in a single step. You'll find the carry out of the MSB is a "0", of course, but the carry into the MSB is a "1". Therefore V = 1 xor 0 = 1. Which is what we hope! However, if you say that "A - B" is the same as "A + cpl(B)" where "cpl(B)" is the twos-complement of "B", ie you do "inv(B) + 1" ahead of the rest of the addition -- as you did -- you'll add "01 + 10" in a separate step. Then you'll find the carry into the MSB is now a "0", and 0 xor 0 = 0, implying no overflow. Wrong answer! That's one of the reasons that ALU designers don't usually implemetn a 2-stage complement-and-add for subtraction, but instead do it with a single-stage invert-add-xor operation (the xor being the addition of the extra "1" which makes the invert arithmetically equivalent to 2s-complement). -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

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Kim and Sym manuals FS on e-bay

by rigdonj＠intellistar.net

See "http://cgi6.ebay.com/aw-cgi/eBayISAPI.dll?ViewListedItems&userid=ramley&inc lude=0&since=-1&sort=2&rows=25" Not connected to the seller. Joe

24 years, 6 months

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8080 vs. 8080A

by ajp166＠bellatlantic.net

Wrong! The I8080A is AS fast as the i8080. the i8080A-1 is faster but not twice as the fastest 8080[A] was only 3mhz and hte standard part was 2mhz. Allison -----Original Message----- From: John Galt <gmphillips(a)earthlink.net> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, September 30, 2001 3:57 PM Subject: Re: 8080 vs. 8080A >"The i8080A is essentially twice as fast as the > standard i8080 and COULD be used more easily with low-power logic since its >demands aren't as stringent". > >Ok, that's a good start. > >But, I don't think "low power" TTL (transistor transistor logic) had >anything to do with the complexity of the code being executed on the chip. >True? I had assumed >that the references to the 8080 only being compatible >with "low-power TTL" and the 8080A being compatible >with "standard TTL" had something to do with the support chips (Ram, clock, >etc) that could be used with the 8080 vs. the 8080A. > >Since I'm new to this mail list, let me explain why I would >show up here and ask such a question to begin with. > >I'm a chip collector. I am trying to document the differences between the >different early Intel microprocessors. Not worried about massive detail, >just the major differences (PMOS, vs. NMOS, vs. >HMOS, clock speed, transistor count, etc). > >The only microprocessor that I don't have a good handle >on is the 8080 and the difference between the 8080 and 8080A. > >I also know that the 8080 was introduced sometime >around April 1974. I have not been able to find an >introduction date for the 8080A. Was it introduced at >the same time? Does anyone know? > >I also need an Intel C8080 or C8080-8 for my >collection. If you have one, I want it. I have been looking >for one for months and have not been able to find one. >If you have either of these chips in good condition >(no desoldered parts wanted), I'm offering 400.00 >for the C8080-8 and 500.00 for a C8080. > >If you need a replacement for the C8080 or C8080-8 you sell me, I'll GIVE >you a D8080A free as part of the >deal. > >----- Original Message ----- >From: "Richard Erlacher" <edick(a)idcomm.com> >To: <classiccmp(a)classiccmp.org> >Sent: Sunday, September 30, 2001 1:21 PM >Subject: Re: 8080 vs. 8080A > > >> This makes no sense at all, though it may be because I'm misinterpreting >the way >> in which you've put it. >> >> I have Intel boards that come in versions with the i8080 and also, >> optionally,with the i8080A, and, aside from the clock frequency and memory >> access times, they're identical. The i8080A is essentially twice as fast >as the >> standard i8080 and COULD be used more easily with low-power logic since >its >> demands aren't as stringent. >> >> The i8080A will, AFAIK, replace the i8080 in all applications without ill >> effects. >> >> BTW, please turn off "rich-text" mode in your email editor when you >compose >> messages for this group, as some folks' mail readers can't interpret the >> rich-text/HTML format. >> >> Dick >> ++++++++++++++++++++++++++++++++++++++ >> ----- Original Message ----- >> From: John Galt >> To: classiccmp(a)classiccmp.org >> Sent: Sunday, September 30, 2001 10:17 AM >> Subject: 8080 vs. 8080A >> >> >> Can anyone here describe the technical differences between >> an Intel 8080 and Intel 8080A CPU? >> >> The ONLY ref. I have been able to find seems to indicate that there was a >bug in >> the 8080 and as a result it would only work with low power TTL? >> >> The problem was fixed in the 8080A and it would work with standard TTL? >> >> Does this make sense to anyone? >> >> Could anyone put this into laymans terms for me? >> >> Thanks, >> >> George Phillips - gmphillips(a)earthlink.net >> >

24 years, 6 months

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Stupid question that's been annoying me

by pete＠dunnington.u-net.com

On Sep 30, 12:06, Jeffrey S. Sharp wrote: > On Sun, 30 Sep 2001, Pete Turnbull wrote: > > > you're assuming (on the left) that "carry" is the same as "borrow". > > This works itself out exactly like that below. > > > However, you'll get the right answer if you say that "A - B" is the > > same as "A + inv(B) + 1" where "inv(B)" is the ones-complement of B. > > Bingo! That fixed it: > > * I get correct overflow flag values. > > * The correct borrow flag value is the opposite of the carry out of the > addition. Did you notice that in a few cases, your carry wasn't the opposite of the borrow, in the original table? But it sorted itself out so that it was consistent once you used "A + inv(B) + 1" on the right hand side. > Now what's disturbing is that the same wrong ideas that I was taught were > taught to an entire roomful of college students a few years ago, by a > professor in the School of Electrical and Computer Engineering. Maybe part of the confusion arises because many processors (including the 8080) complement the carry flag at the end of a subtraction, so that it can be used directly as a "borrow" flag in multibyte subtractions. Others (like the 6502) don't do that. The confusion over the overflow usually arises because people are told that adding the two's complement of a number is equivalent to subtraction. That's not so much "wrong" as "incomplete". As you've seen, it's arithmetically but not logically equivalent. If you combine the carry-into-MSB from the compliment op with the carry-into-MSB from the subsequent addition, they would be logically equivalent as well, but you'd also need to do this for the carry flag otherwise subtracting 0 tends to give the wrong result :-) Since you're thinking about 2's complements, and I've mentioned you could combine the carry-in from the complement operation with the carry-in in the addition, you might like to think about different ways of performing the 2's complement. The way usually explained is "invert the bits and add a 1". There's another common way: find the *rightmost* '1' in the number. Invert every bit to its left. Done. Now where's the carry in that? Oh, and you need to use a particular search order to find the "rightmost 1". > Thanks for the help. You're welcome. It took me a few minutes to realise what was wrong, so it was an interesting exercise :-) -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

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Possibility of Classic Computing Garage Sale/Auction

by vaxcat＠retrocomputing.com

I hope this information helps. >So what (please be sepecific, and include details, e.g. how COMPLETE the stuff >is, i.e. manuals, drivers, etc.) APPLE][ stuff do you have? I have working II+, IIe and a IIgs computer with 1.5 meg upgrade board. I have alot of original diskettes and manuals for most of the common Apple stuff. I have one or two of the original red books, joysticks, floppy drives, etc. I also have a John Bell Engineering voice synth card with diskettes and a BAL-500 eprom programmer. I'm not an >APPLE-freak, but in order to do a couple of 1-time tasks, I need a couple of >things. I'm also interested in S-100 cards, particularly if they're >documented >and complete with software, but I don't need backplanes or boxes, nor do I >need I do have a few S100 cards. Mostly they're undocumented static and dynamic memory boards (which are easy to figure out). However, I do have a MM103 modem and documentation but no software and the S100 hayes micromodem with the direct connect coupler interface. I also have a SMB multifunction card in bad shape and one or two Diskjockey IIds if I recall, with documentation but no software. I have a bunch of 8" diskettes with Xerox 820-II stuff on them including boot disks. >8" FD drives, as I have plenty. > >If you have the apple interface for that Xebec HDD, I'd be interested in that, >as well, maybe, depending on how complete it is. > The Xebec does include the interface and driver diskettes but no documentation. However, I was able to easily figure it out. Mostly if you just plug it into slot#5 and do a pr#5 after booting, it'll boot. >let me know, plz > >regards, > >Dick > >----- Original Message ----- >From: "Anthony Clifton - Retrocomputing.com" <vaxcat(a)retrocomputing.com> >To: <classiccmp(a)classiccmp.org> >Sent: Sunday, September 30, 2001 10:47 AM >Subject: Possibility of Classic Computing Garage Sale/Auction > > >> >> So, here's the deal. From time to time, I get the itch to collect classic >> computing >> stuff. I collect a bunch of stuff, pile it up in my house and then the >> itch is scratched >> and I forget about it for a while. >> >> What compels me to do this I don't pretend to understand. But the simple >> fact is that >> most of you are doing such a good job collecting, restoring and preserving >> this stuff >> that there's just no need for me to do it. In other words, because I'm >> pursuing my >> own interests which take alot of space, the time has come to choose either >> to be a >> classic computer collector or not to be. (IE it's time to sh*t or get off >> the pot.) >> >> Therefore, I'm considering sending ALL my classic computing stuff to live >> with the >> rest of you where it will be preserved and loved. This will free up ALOT >> of space >> in my house to pursue interests such as art and photography. >> >> And I'll get to see alot of smiling faces taking home treasures. >> >> Mind you, I'd like to get some money back out of this stuff but not >> necessarily as >> much as I'd get on Ebay. >> >> So I'm considering holding a garage sale/auction at my home the last weekend >of >> October in Des Moines, Iowa. More valuable items would be auctioned >>over the >> course of an hour or so while less valuable (more common) items would simply >> be priced, haggled and sold. >> >> Stuff that would be sold or auctioned includes: Apple II stuff, Kaypro II, >> Epson QX10, Green >> screen monitors, Microvax II, Vaxstation 3100, Sun 3/60, 3/110s, Sun mono >> monitors, mice, keyboards, books. I have a Cisco IGS router (now 10 years >> old), >> a livingston 10 port terminal server, a TIE S100 chassis, a Vector S100 >> business >> computer with 8" hard disk in separate enclosure, around a dozen s100 cards, >> macintosh plus and other macintosh equipment, an 8" drive in it's own >> enclosure, >> a Shugart SA800 bare drive, software, books and all kinds of miscellaneous >> bits of >> hardware and software. I also have a 9 track streaming tape drive that >> goes with >> the Microvax II. >> >> I also have an old tektronix scope with aluminum rolling cart, a 19" dual >width >> bud rack (4' tall appox), a crusty Northstar chassis and some other >> miscellaneous >> ham radio and electronics equipment. >> >> Also, of note, I have a 19" color terminal (the Intelligent Systems Corp >> unit I mentioned >> a few months ago), a vt102 and 2 or 3 vt220s with keyboards. I also have a >> Xebec 10 meg >> hard disk for Apple II machines and other weird and bizarre stuff. >> >> As I say, although I want to get a few bucks out of the stuff, I also want >> everything >> to go. So I'm willing to haggle. This would send it all away in one big >> shot for me, >> which would be absolutely wonderful. It'd also make me feel alot better >> than putting >> stuff in a dumpster or sending it to Goodwill. >> >> So, essentially, what I'm looking for is this: If I were to hold this the >> last Saturday >> of October, how many people would be able to come or send another collector >> on their >> behalf? It would be in Des Moines, Iowa. >> >> Please send me an email if you would be able to attend and, if enough >> people express >> interest, I'll make specific plans and post them this week. >> >> Thanks and I hope everyone will see this as a positive thing and not be too >> hard on me >> for wanting to pursue my other interests. >> >> Anthony Clifton >> Des Moines, Iowa >> >> >>

24 years, 6 months

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good stuff available in OC this weekend

by dittman＠dittman.net

> On September 29, Doug Salot wrote: > > This weekend only in Orange County, CA: > > AIM65 > > Dynabyte S-100 > > Rockwell Design Center > > http://www.blinkenlights.com/classiccmp/aim65/design3.jpg > > maybe some other stuff > > > > Preference goes to somebody who offers to haul it all away by noon Sunday. > > Contact me by email for more info. > > Oh, how I'd love to get my grubby paws on that Dynabyte. :-| I'd love to get the AIM65, but I'm not in Orange Counter. :-( -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

24 years, 6 months

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Attaching a VT100 to a PC....

by healyzh＠aracnet.com

OK, I managed to dig out a VT100 out of storage. Of course the first path I burrowed all the way back led to a VT103, so I had to dig an even more difficult path. Anyway, I've got it hooked up to the Intel 810e board I'm using for my Desktop PDP-10 project. I've got Linux set so I can log in and do stuff. The terminal seems happiest working at 9600. Under TOPS-10 V7.03 I can do a DIR in a small directory and everything is fine, but if I run it in a big directory such as SYS:, then I get slightly garbled data. Same thing if I run a SYSTAT, it's garbled, especially the last part. I'm not up on Serial stuff and I've seen simular results hooking up one of my VT420's to Sun Sparc. Is the problem my cabling, or what? At the moment I'm using what looks to be a LapLink cable (or the equivalent). For the finished project I plan to build a custom cable. Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast | | | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | PDP-10 Emulation and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

24 years, 6 months

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Attaching a VT100 to a PC....

by ajp166＠bellatlantic.net

Simple, DEC terminals like to use Xon/Xoff flow control protocal and will run ok without it if the baud rate is low enough. You have two choices either hardware flowcontrol, or enable and use xon/xoff. I'd suggest the latter as it's the common way for DEC systems. Allison -----Original Message----- From: Zane H. Healy <healyzh(a)aracnet.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, September 30, 2001 2:22 PM Subject: Attaching a VT100 to a PC.... >OK, I managed to dig out a VT100 out of storage. Of course the first path >I burrowed all the way back led to a VT103, so I had to dig an even more >difficult path. > >Anyway, I've got it hooked up to the Intel 810e board I'm using for my >Desktop PDP-10 project. I've got Linux set so I can log in and do stuff. >The terminal seems happiest working at 9600. Under TOPS-10 V7.03 I can do >a DIR in a small directory and everything is fine, but if I run it in a big >directory such as SYS:, then I get slightly garbled data. Same thing if I >run a SYSTAT, it's garbled, especially the last part. > >I'm not up on Serial stuff and I've seen simular results hooking up one of >my VT420's to Sun Sparc. Is the problem my cabling, or what? At the >moment I'm using what looks to be a LapLink cable (or the equivalent). For >the finished project I plan to build a custom cable. > > Zane >-- >| Zane H. Healy | UNIX Systems Administrator | >| healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast | >| | Classic Computer Collector | >+----------------------------------+----------------------------+ >| Empire of the Petal Throne and Traveller Role Playing, | >| PDP-10 Emulation and Zane's Computer Museum. | >| http://www.aracnet.com/~healyzh/ |

24 years, 6 months

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Attaching a VT100 to a PC....

by pete＠dunnington.u-net.com

On Sep 30, 10:46, Zane H. Healy wrote: > Anyway, I've got it hooked up to the Intel 810e board I'm using for my > Desktop PDP-10 project. I've got Linux set so I can log in and do stuff. > The terminal seems happiest working at 9600. Under TOPS-10 V7.03 I can do > a DIR in a small directory and everything is fine, but if I run it in a big > directory such as SYS:, then I get slightly garbled data. Same thing if I > run a SYSTAT, it's garbled, especially the last part. Sounds like handshaking, or rather, lack of it. I'd guess the terminal can keep up for a while, but there comes a point where it has to scroll or something, it sets the handshake to tell the other end to wait a moment, but the other end doesn't, and a character or a few get dropped or garbled while the terminal does its housekeeping. Have you got the same kind of handshaking set up at both ends (ie both software XON/XOFF, or both CTS/RTS or both DTR/DSR)? Usually VTs want to use XON/XOFF. -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

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8080 vs. 8080A

by ajp166＠bellatlantic.net

Since this is about 8080/8080A the answer is fairly complex and simple at the same time. The 8080A had improved drive (not that much better) and improved interupt to hold timing. There were a few other minor differences of no real consequence. The 8080 was a bear with regard to DMA (hold/) and the 8080A was slightly better. Neither were that much fun to work with. For non-DMA designs the difference is insignificant. Both worked fine wtih Standard TTL _IF_ you followed fanout rules and buffered things correctly. Allison -----Original Message----- From: Russ Blakeman <rhblakeman(a)kih.net> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, September 30, 2001 2:04 PM Subject: RE: 8080 vs. 8080A >Hadn't heard anything of an 8088/86 series bug but I know there's a 32 bit >applications lockup problem in some 386DX-16's and the well known floating >point math problem in the original Pentium series. > -----Original Message----- > From: owner-classiccmp(a)classiccmp.org >[mailto:owner-classiccmp@classiccmp.org]On Behalf Of John Galt > Sent: Sunday, September 30, 2001 11:18 AM > To: classiccmp(a)classiccmp.org > Subject: 8080 vs. 8080A > > > Can anyone here describe the technical differences between > an Intel 8080 and Intel 8080A CPU? > > The ONLY ref. I have been able to find seems to indicate that there was a >bug in the 8080 and as a result it would only work with low power TTL? > > The problem was fixed in the 8080A and it would work with > standard TTL? > > Does this make sense to anyone? > > Could anyone put this into laymans terms for me? > > Thanks, > > George Phillips - gmphillips(a)earthlink.net >

24 years, 6 months

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Wang 2200: video timing problem & questions

by frustum＠pacbell.net

After a few years of searching, I finally have a Wang 2200 computer (2200-T style CPU, to be exact). Parts of it have been arriving from Dallas for the past four months. The last piece arrived yesterday, the 2226 keyboard/monitor. Yeah! Unfortunately, the monitor just doesn't sync at all. Not having worked a whole lot with video, I was hoping someone could steer me in the right direction. I'll explain what I know so far. First, this monitor, cable, and CPU were all part of a set -- I'm not mixing and matching. Supposedly the video was fine when it left Dallas a week or two ago. The video goes from the CPU to the monitor over a single coax and has composite sync. Video is baseband monochrome. There are a couple hidden pots that can be twiddled, and I have, but the best I can do is get it to a slow roll/tear. It is an impossible task as just thermal drift causes the screen to wander. Neither vsync nor hsync appears to work at all. At first I thought I just would have to tweak the H & V pots into the lock range of the PLL that controls the sync but there appears to be no locking zone. I got a standard monitor that I use with my Sol and hooked it up. The screen rolled wildly. By adjusting the H & V controls on that monitor, I could get it to sync both axes, but the video was not readable -- it was locking to some multiple/submultiple so the image was stable but not coherent. Thus it seems to rule out the unlikely case that the original monitor is OK and the video card is putting out signal but no sync. So then I broke out my crappy scope that I picked up a hamfest, but which is good enough for this job. I measured some timings. Interestingly, the scope has TV V sync and TV H sync trigger modes; both worked properly to lock the signal. Thus the timing is close enough to normal video for the scope to think it was OK. Timings below are as good as I can measure with this scope; 5% error wouldn't be unlikely. I've put in square brackets the figure for normal US television timing (from a web page that I just looked up) vertical period: ~16.8 ms/frame [ 1/60 = 16.67 ] v blanking: 4 scan lines v front porch: 17 scan lines v back porch: couldn't trigger it in a way to count them v active: there are 24 rows of text, each on 11 scan lines, or 264 scans, = 15.3 ms horizontal period: 58 us [63.5] h sync: 2 us [4.7] h front porch: 7 us [4.7] h video: 47 us [52.6] h back porch: 3.5 us [1.5] dc level: 0.7v sync: 0v video white; 1.4 v [ignore the voltages somewhat -- I was measuring them using a high-impedance scope probe and a properly terminated coax would probably lower those figures] So here are my specific questions; if you have any thoughts and have read this far, don't limit your responses to these questions, though. 1) Doesn't is seem odd that neither H nor V sync lock? What would cause both to go out at the same time during shipment? 2) Doesn't it seem odd that the timing is pretty close to nominal but my 2nd monitor can lock but not get a proper picture? 3) Any thoughts about what I should try next? I have no schematics or technical docs for any of this. Thanks for any ideas, even crackpot ones. ----- Jim Battle == frustum(a)pacbell.net

24 years, 6 months

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IBM ROM BASIC or lack thereof

by mcguire＠neurotica.com

On September 30, Absurdly Obtuse wrote: > it wouldn't surprise me if there were some people who just copied IBM > BIOS, but slipped through the cracks of the IBM copyright enforcement > patrol. Indeed, I did exactly this with my first XT clone, built from a kit with a bare PCB... -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

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Stupid question that's been annoying me

by mcguire＠neurotica.com

On September 30, Jeffrey S. Sharp wrote: > Now what's disturbing is that the same wrong ideas that I was taught were > taught to an entire roomful of college students a few years ago, by a > professor in the School of Electrical and Computer Engineering. Those who can, do... -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

1
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PolyMorphic Computers

by DHaywood＠larimer.cccoes.edu

I happened upon an older message/discussion about the PolyMorphic systems. I have a lot of that stuff - including many of the user's groups newsletters/original software/manuals, etc. I built mine in 1975 or 1976. It still works but I never used the original toaster case. You indicated that you could use some of the source code. Seems to me that I have some of that in machine/assy language. If you'd like to chat - e-mail me. Don haywood

24 years, 6 months

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Anybody want some VT keyboard keys...

by kevan＠heydon.org

I have about 190 assorted blank VT keyboard keys. A picture of a few of them is here: http://www.heydon.org/kevan/pictures/vtkeys.jpg A handfull have some hand written stuff on them already. Free to a good home. -- Kevan Collector of old computers: http://www.heydon.org/kevan/collection/

24 years, 6 months

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VME 3 to 2 board up for grabs (UK)

by kevan＠heydon.org

Hi, I have a Dawn VME 3 to 2 Adapter version 5 (Model: SUN9U400/6U-4) that I no longer want. As a bonus you get the Imaging Technology Inc. card in it too. There are no model numbers on this card but I am guessing it is some sort of frame grabber. -- Kevan Collector of old computers: http://www.heydon.org/kevan/collection/

24 years, 6 months

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IBM 5150

by mcclure3＠home.com

I found an IBM 5150 at a thrift store the other day. I don't usually pay much attention to PeeCee's, but the price of this one was about right-- $3.50 complete with dual floppies and monochrome monitor. I don't have any boot disks for PC's this old. When I initially turned it on, it would start up BASIC, which apparently is in ROM on these machines. Lately, it hangs on a rapidly flashing left cursor, sometimes moving to a rapidly flashing cursor at the top middle of the monitor. Questions: Anybody know what causes this? Power supply? Video card? Loose chip? What's the deal with the BASIC in ROM on these machines? Any other early PeeCee's have this feature? Thanks! Don McClure Bel Air, MD

24 years, 6 months

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Stupid question that's been annoying me

by jss＠subatomix.com

Yes, I'm actually going to ask a question about two's complement arithmetic! I feel quite stupid for mailing this, but I just can't figure it out. And believe it or not, it really does have something to do with classic computing. All right, here goes... While I was in class Thursday, I got bored and decided to pass the time by verifying that A-B=A+(-B) in two's complement binary arithmetic, using an imaginary machine with a word size of 2 bits. I created the following table: Subtraction Equivalent Addition AA-BB=CC CZSV AA+BB=CC CZSV 01 01 00 .x.. 01 11 00 xx.. 01 00 01 .... 01 00 01 .... 01 11 10 x.xx 01 01 10 ..xx 01 10 11 x.xx 01 10 11 ..x. 00 01 11 x.x. 00 11 11 ..x. 00 00 00 .x.. 00 00 00 .x.. 00 11 01 x... 00 01 01 .... 00 10 10 x.xx 00 10 10 ..x. 11 01 10 ..x. 11 11 10 x.x. 11 00 11 ..x. 11 00 11 ..x. 11 11 00 .x.. 11 01 00 xx.. 11 10 01 .... 11 10 01 x..x 10 01 01 ...x 10 11 01 x..x 10 00 10 ..x. 10 00 10 ..x. 10 11 11 x.x. 10 01 11 ..x. 10 10 00 .x.. 10 10 00 xx.x The left half iterates through all possible subtractions, which were each performed by hand by binary subtraction. The results and the states of the machine's flags (Carry/borrow, Zero, Sign, oVerflow), are shown. The right half contains the same subtractions, this time done by adding by hand the minuend and the two's complement of the subtrahend. Note that the C and V flags behave differently in each half. This is very disturbing, since I'm fairly certain that subtraction is implemented in many processors as adding a negated subtrahend (ergo, I should see no difference in the flags). What have I done wrong in my table? -- Jeffrey S. Sharp jss(a)subatomix.com

24 years, 6 months

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Unusual Diskettes - Niniendo

by mranalog＠home.com

"Iggy Drougge" wrote: > I'm sory, but the URL goes to a "restricted area". You just need to copy and paste the rest of the link: os&.dnm=Niniendo.jpg&.src=ph > Nintendo produced a disk drive for the Famicom/NES These are the only disk drives I have that are battery powered - 6 "C" cells each. --Doug ========================================= Doug Coward @ home in Poulsbo, WA Analog Computer Online Museum and History Center http://www.best.com/~dcoward/analog =========================================

24 years, 6 months

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good stuff available in OC this weekend

by mcguire＠neurotica.com

On September 29, Doug Salot wrote: > This weekend only in Orange County, CA: > AIM65 > Dynabyte S-100 > Rockwell Design Center > http://www.blinkenlights.com/classiccmp/aim65/design3.jpg > maybe some other stuff > > Preference goes to somebody who offers to haul it all away by noon Sunday. > Contact me by email for more info. Oh, how I'd love to get my grubby paws on that Dynabyte. :-| -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

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TRW finds, 8" floppies, 68k PC

by mcguire＠neurotica.com

On September 29, Mike Ford wrote: > Peripheral Technology PT68K-2 from Computer Digest 1987 articles. > This is a single board computer that fits in a XT case, but has a 10 mhz > 68000 processor, 32 memory chips (HY53C256LS-80), floppy drive connector on > ribbon cable, header marked winchester, etc. In the orignal box with > manuals (board, humbug monitor, and dos), and floppies for SK DOS (Star K > software with the HUMBUG rom on board), plus about a dozen misc 5.25" > floppies and a comm program on 3.5" floppy. Looks like all the construction > articles (cut) from Computer Digest 1987 by Peter Stark (ie Star K > software), 1 issue of 68 Micro Journal, and a couple other 68k newsletters. > Apparently this is designed towork in a XT case with XT monitor and > keyboard. Without sounding too ebayish, this is a one of a kind very > complete example of early computing. Oh wow...THAT is COOL. :-) -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

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RS6000 7012-320H

by cmurillo＠emtelsa.multi.net.co

At 09:21 AM 9/29/01 -0500, Paul Thompson wrote: >Recent versions of AIX will run, with 64MB and a compatible (or >non-existent) framebuffer. uh oh. The machine has 16MB; if I completely replace the SIMMs with the ones I have (assuming they fit this beast) then it will have 32MB. >> 2) What exactly is this "ethernet riser card"? Do I have >> a network-less system? >There's probably an ethernet chip on the main board which just needs the >AUI/BNC logic on the riser card added to work. You should be able to get >a Microchannel enet card for cheap watching on ebay if you can't find the >riser. Hans pointed out that not just any MCA card will do; it has to be specifically for RS6k. >The IBM sales manual might help, plug in the part numbers for your >machines: >http://www2.ibmlink.ibm.com/cgi-bin/master?xh=jN7O$Vn32jOgss0USenGnN9332&re quest=usa.salesmanual&parms=&xhi=usa%2emain&xfr=N Thanks! carlos. -------------------------------------------------------------- Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org

24 years, 6 months

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FS: Radio Shack EC-4075 Calc

by rhblakeman＠kih.net

Here's something I go some time ago (years ago, probably 1988) that I have absolutely NO use for an the recent talk about calcs has me wondering if anyone might want to add this to their collection, or has an actual use for it. It's a Radio Shack EC-4075 "Programmer's Hex and Time Calculator", catalog number 65-990. It's in good clean shape but no docs, box or anything else. It's fully finctional too - has batteries (2xAA) in it and showing the date and time right now. It's just excess and it's bound to get damaged around here or set in a drawer where the batteries will undoubtedly leak and ruin it. Size is 3" wide, 5" long and 1" at the thickest point. Make me an offer. It will ship without the batteries though to save weight and prevent damage. Weight is probably a pound packed and would be shipped in bubble wrap in a sturdy box. Not sure if it would be cost effective to ship overseas but the US and Canada are alright for sure. Be reasonable on offers, $1 is not reasonable. My wife bought this for me back then and while I forget what it cost then I know it wasn't a $5 item. Contact me direct if interested at rhblakeman(a)kih.net

24 years, 6 months

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Still looking

by workstations＠poczta.onet.pl

Hi, I am still looking for the Digital Alpha 233 MHz 21066A CPU. I am interested in buying it or swapping it for the following Alpha hardware: 2x Digital Alpha 166 MHz 21066 CPU 1x Digital Alpha 233 MHz 21064BB CPU 1x Digital Alpha 266 MHz 21164AA CPU 1x Digital PBXGA video card 1x Digital PBXGB video card Best Regards, Jacek Artymiak -- Zagraj z finalistkami Miss Polonia [ http://miss.onet.pl/start.html ]

24 years, 6 months

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Silent 700 Tape

by cmansure＠rt66.com

I have a caset tape created with a Silent 700. Is there anywhere I can get it converted into a ASCII file.

24 years, 6 months

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Central FL Computer Junk Fest

by rigdonj＠intellistar.net

At 10:33 AM 9/28/01 -0400, you wrote: >Hmmm, is there going to be one up here around Connecticut sometime? Sure, if you'll organize it. Joe

24 years, 6 months

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Central FL Computer Junk Fest

by acme_ent＠bellsouth.net

Due to the events of last week, and inclement weather, the CFCJF has been rescheduled for Sun. Sept. 30th, 9 AM. If you have any questions or need directions please contact me off-list. See ya there! Glen 0/0

24 years, 6 months

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Odd VT100 question

by healyzh＠aracnet.com

> ! Sounds like I need to either find a smaller PowerSupply, or > ! else I'm going to have to have it external to the system > ! (which I don't want). > > What about taking the power supply out of the metal case? (Re)build a power > supply to fit? Also, I have seen some pretty small ATX power supplies. about > 1/2 to 2/3 the size of an AT PSU... If I don't find a smaller PS tomorrow, that's probably what I'll do. The thing is I'd kind of like to keep the one I have intact to use for something else. On a positive note, yesterday I tracked the system freezes down to 'kdm' (the KDE version of xdm) and then discovered there was also a daily cronjob set to run at 12:15am that would also lock up the system. So I've corrected those problems (removed them actually since I don't have any use for either) and now have the board running happily with only a HD and Monitor plugged in (and I don't see any problem disconnecting the monitor, if nothing else I've got a plug I can stick in to make it think it still has one). So, I'm down to needing to get a VT100 out of storage tomorrow if I can find the time. Zane

24 years, 6 months

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CBM8032 - wobbly screen

by pete＠dunnington.u-net.com

On Sep 28, 18:26, Tony Duell wrote: > Now, the 8032 uses a 6845 CRT controller chip IIRC. It sets the sync > frequencies. Maybe it's configured differently on UK and US machines. > Maybe, therefore, one of the ROMs is different between UK and US machines > (I don't recall any setup links on the CPU board to configure this, as > some other manufacturers used). Does anybody know if UK PETs have 50Hz > vertical display systems? If they do, then you might need a dump of the > appropriate ROMs. It does use a 6845, and it does still run at 60Hz. At least, the ones I've worked on are 60Hz and I think the 4000 series did too; I don't know if that changed in any later models. -- Pete Peter Turnbull Network Manager University of York

24 years, 6 months

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Calc wars

by mcguire＠neurotica.com

On September 27, Mike Ford wrote: > > Man, you're hangin' out in the wrong places. I haven't laid eyes on > >a Windoze box in months. > > REALLY? I saw about 1000 in a scrap yard today on pallets waiting to be > recycled, lovely site. ;) Ahh, fit for a painting on a wall. :-) -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

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ZX81 kits (was Re: Keep or assemble???)

by acme_ent＠bellsouth.net

Tony Duell wrote: > Yes, but hang on a second. If I don't keep the BASIC (I'd prefer Forth, > and yes I know there was a forth ROM for the ZX81), I modify the display > (so I don't really use the ULA) The ULA does a lot more than handle the display ;>) > I replace the keyboard, and upgrade the > internal RAM, then all I am really using is the Z80. And those are not > hard to find :-).. Okay, you are absolutely correct given the FORTH. I use calls to the BASIC ROM routines from assembly and machine code, so I'm using more than just the Z80 MPU. > In other words, if I'm going to do that level of hacking, I might as well > start from scratch. Not that there's anything wrong in doing that, of course. Of course not ;>) But a ZX81 kit is still faster than starting from scratch. > If I start > with a pre-built unit I have to work around the existing parts. > Or desolder them (which is not impossible, generally). Try desoldering the RF modulator from a ZX81 board ;>) Glen 0/0

24 years, 6 months

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Framebuffers

by vance＠ikickass.org

Hi. Does anyone have a comparison of the performance of the various DEC turbochannel framebuffers? Even a listing of the faster ones would help. Peace... Sridhar

24 years, 6 months

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DSSI Cables

by dittman＠dittman.net

> > Yes, but if the connectors on both ends are the same I would be > > able to use a SCSI cable to go from the 4000 to the HSD05. > Yes. But SCSI cables are often twisted pair (pins 1+25, 2+26, 3+27, > ...) so depending on the DSSI pinout it may be possible that different > DSSI signals go on the same twisted pair. This can lead to > interference if the cables are long. That is true. -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

24 years, 6 months

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KXJ11-CA / M7616 doc wanted.

by jkunz＠unixag-kl.fh-kl.de

Hi. I have this nice KXJ11-CA but I have no clue how to use it. I was able to get to the ODT prompt, but nothing else. I need pinouts, jumper descriptions, memory map (where are the EPROMs?), ... How to use that digital IO port? ... My idea is to use it in a my MicroVAX 4000-200 with the VAX as "frontend processor". So I would be able to run NetBSD/vax and perhaps 2.9BSD in the same box. -- tsch??, Jochen Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/

24 years, 6 months

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DSSI Cables

by dittman＠dittman.net

> > I checked again. The connectors on the VAX 4000/500 are identical to > > SCSI connectors. > But the wiring to the ribbon cable is different. DSSI uses a 1:1 > mapping of pin numbers. The HD50 connector for SCSI is wired this way > to the ribbon cable: > HD50 ribbon > 1 1 > 2 25 > 3 3 > 4 26 > 5 5 > 6 27 > ... ... Yes, but if the connectors on both ends are the same I would be able to use a SCSI cable to go from the 4000 to the HSD05. -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

24 years, 6 months

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Central FL Computer Junk Fest

by DAW＠yalepress3.unipress.yale.edu

Hmmm, is there going to be one up here around Connecticut sometime? --- David A Woyciesjes --- C & IS Support Specialist --- Yale University Press --- mailto:david.woyciesjes@yale.edu --- (203) 432-0953 --- ICQ # - 905818 ! -----Original Message----- ! From: Glen Goodwin [mailto:acme_ent@bellsouth.net] ! Sent: Friday, September 28, 2001 12:57 AM ! To: classiccmp(a)classiccmp.org ! Subject: Re: Central FL Computer Junk Fest ! ! ! Gene: ! ! The Central Florida Computer Junk Fest is being held Sunday Sept. 30 ! starting at 9 AM. The location is: ! ! ACME Discount Computers ! 5511 W. Colonial Drive ! Orlando FL 32808 ! (407) 296-2333 ! ! Whatever you bring must be at least ten years old, and please do *not* ! bring a mountain of 286s . . . ! ! We're near the NE corner of Kirkman and Colonial behind the Wendy's. ! E-mail me off-list if you want more specific directions. ! ! See ya there! ! ! Glen ! 0/0 ! ! ---------- ! > From: Gene Ehrich <gehrich(a)tampabay.rr.com> ! > To: classiccmp(a)classiccmp.org ! > Subject: Re: Central FL Computer Junk Fest ! > Date: Thursday, September 27, 2001 10:51 PM ! > ! > At 09:35 PM 9/27/01 -0400, you wrote: ! > >From: Louis Schulman <louiss(a)gate.net> ! > > > Hope to see everyone there! ! > > ! > >I'm looking forward to meeting everyone there too. ! Please send some ! email ! > >off list and let me know what you're bringing and want. ! > > ! > >;) ! > >- Mike: dogas(a)bellsouth.net ! > ! > I must have missed the original messages on this. ! > ! > Where is it and when and what can I expect to find there? ! > ! > ! > ! > !

24 years, 6 months

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Odd VT100 question

by DAW＠yalepress3.unipress.yale.edu

This is quite a neat idea... ! > The PSU occupies the space at the back of the terminal, but ! > only extends halfway forward, so there is space underneath ! > the flare of the tube of 10"W x 4.75"H x 5"D. Of course ! > you'd not want to disrupt the picture. (Memo to self: must ! > sort out vertical linearity on mine!) ! > ! > At the back right hand side (again, as you look at the picture), ! > underneath the high tension wire to the tube, there is a space 4"W x ! > 3.5"H x 5"D. ! ! Sounds like I need to either find a smaller PowerSupply, or ! else I'm going to have to have it external to the system ! (which I don't want). What about taking the power supply out of the metal case? (Re)build a power supply to fit? Also, I have seen some pretty small ATX power supplies. about 1/2 to 2/3 the size of an AT PSU... --- David A Woyciesjes --- C & IS Support Specialist --- Yale University Press --- mailto:david.woyciesjes@yale.edu --- (203) 432-0953 --- ICQ # - 905818

24 years, 6 months

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Calc wars

by dhquebbeman＠theestopinalgroup.com

> I quit using most of my other calculators and, today, use an HP 25C almost > exclusively, though I have a '21 also. I didn't know those were collectibles. > back in the '70's, I modified the battery holder so I could replace the > batteries when they went bad. This was a common problem. The use of 1.5-volt > batteries probably won't hurt anything if my own calculators are any indication, > though I've usually replaced the NiCd types with others of the same sort. Way back in '77 (I think), I got a mailing from TI advertising and offerring for sale the TI Programmer, which was a simple 4-function calculator in that standard black-plastic format they used to use, replete with the also-standard LEDs. However, it wasn't actually a four-function calculator, because it included radix conversion and several standard logical operators. At home, when I need radix conversion, instead of the Casio Fx-115m or the Calc accessory, I still reach for the TI Programmer... -dq

24 years, 6 months

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CBM8032 - wobbly screen

by Martin.Kaeser＠auge.de

Adrian, a CBM8032 rock-steady with 60 Hz power supply (US) may wobble on a 50 Hz line (UK). Martin > Date: Fri, 28 Sep 2001 01:32:01 +0100 > From: Adrian Vickers <avickers(a)solutionengineers.com> > Could a flakey transformer be making the screen wobble? How do transformers > go flakey anyway, if indeed they *can* co flakey? Or is the US chap telling > porkies?

24 years, 6 months

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DSSI Cables

by dittman＠dittman.net

> Okay, my two HSD05 controllers arrived. I never paid attention to > the DSSI connector before, so I thought it was the same as a SCSI > connector, but it isn't. Does anyone know of a source for cheap > DSSI cables? I checked again. The connectors on the VAX 4000/500 are identical to SCSI connectors. The connector on the Tri-Link connector (part number 12-39921-01) are different, though. -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

24 years, 6 months

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Central FL Computer Junk Fest

by acme_ent＠bellsouth.net

Gene: The Central Florida Computer Junk Fest is being held Sunday Sept. 30 starting at 9 AM. The location is: ACME Discount Computers 5511 W. Colonial Drive Orlando FL 32808 (407) 296-2333 Whatever you bring must be at least ten years old, and please do *not* bring a mountain of 286s . . . We're near the NE corner of Kirkman and Colonial behind the Wendy's. E-mail me off-list if you want more specific directions. See ya there! Glen 0/0 ---------- > From: Gene Ehrich <gehrich(a)tampabay.rr.com> > To: classiccmp(a)classiccmp.org > Subject: Re: Central FL Computer Junk Fest > Date: Thursday, September 27, 2001 10:51 PM > > At 09:35 PM 9/27/01 -0400, you wrote: > >From: Louis Schulman <louiss(a)gate.net> > > > Hope to see everyone there! > > > >I'm looking forward to meeting everyone there too. Please send some email > >off list and let me know what you're bringing and want. > > > >;) > >- Mike: dogas(a)bellsouth.net > > I must have missed the original messages on this. > > Where is it and when and what can I expect to find there? > > > >

24 years, 6 months

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TI 99 available in Broomfield, CO

by vaxman＠qwest.net

There is an ad in this weeks Broomfield Enterprise paper for a TI99 available free, but I didn't bring the ad home. Contact me if interested (offlist). clint

24 years, 6 months

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Calc wars

by mcguire＠neurotica.com

On September 27, Richard Erlacher wrote: > I'm still partial to having some of those functions, too, but with a computer > running Windows nearly everywhere I turn, the calculator that's built-in there Man, you're hangin' out in the wrong places. I haven't laid eyes on a Windoze box in months. -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

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FT: DEC rack cover panels

by mrbill＠mrbill.net

A couple of weeks ago, I mentioned that I was looking for some of the black/off-white 10"x19" front "cover panels" that go on a rack of DEC equipment (black "crinkly" with a white border). I've now got a box of at least 7 of them, with more on the way. Anybody need one or two? I'd like to trade for something else interesting, but not necessarily computer-related. Old civil defense stuff (geiger counter, etc), phone stuff (old switch docs, Bell System stuff, things like that), etc. Alternately, looking for good-brand 10baseT hubs or switches. Anyway, if you can use one or two or more of these, let me know. I'm only going to keep one or two for myself, so the rest are available. Bill -- Bill Bradford mrbill(a)mrbill.net Austin, TX

24 years, 6 months

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DSSI Cables

by dittman＠dittman.net

Okay, my two HSD05 controllers arrived. I never paid attention to the DSSI connector before, so I thought it was the same as a SCSI connector, but it isn't. Does anyone know of a source for cheap DSSI cables? -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

24 years, 6 months

2
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Odd VT100 question

by healyzh＠aracnet.com

Paul Williams wrote: > "Zane H. Healy" wrote: > > > > OK, I'm thinking of doing a wierd mod on a VT100, just how much room > > is inside one of them? I need room for a 7 1/2" x 9" x 2 1/2" board > > (the 2 1/2" is thanks to the heatsink and RAM), and would also like > > to be able to fit in a smallish 250W PS (3 1/2" x 5 1/2" x 6"), and > > a 3 1/2" HD. > > I've put two photos of a topless VT100 in http://vt100.net/zane/ which > might give you some idea of the shape of space available. Thanks, between them and the description you've given I've got a lot better idea. > On the left hand side of the photos you see the card cage. The space > there is 10.5"H x 10.5"D x 3.25"W (but only 2" unobstructed to the > back). You might be able to make that 2.25"W to the back with a bit of > persuasion. This isn't a huge problem as the 2.5" dimension I give is for the heatsink and fan on the motherboard. It looks like I should be able to fit the motherboard in this cavity, I rather thought I could since a VT103 used this to squeeze in a PDP-11. > The PSU occupies the space at the back of the terminal, but only extends > halfway forward, so there is space underneath the flare of the tube of > 10"W x 4.75"H x 5"D. Of course you'd not want to disrupt the picture. > (Memo to self: must sort out vertical linearity on mine!) > > At the back right hand side (again, as you look at the picture), > underneath the high tension wire to the tube, there is a space 4"W x > 3.5"H x 5"D. Sounds like I need to either find a smaller PowerSupply, or else I'm going to have to have it external to the system (which I don't want). Unfortunatly I seem to have run across another stumbling block besides the size of the powersupply. It seems that the system is pretty much rock solid if it has the keyboard, mouse, AND CD-ROM plugged in, however if I unplug either the CD-ROM or the USB Keyboard and Mouse the system will lock up after it's been up for between half an hour and two hours. I've been unable to find any logs or reason for it locking up. I'm using SUSE Linux 7.2 Professional for this setup. In any case, hopefully I'll be able to dig one of my VT100's out of storage on Saturday. Zane

24 years, 6 months

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Calc wars

by Robert.Stokes＠vu.edu.au

I've still got a working HP25 that I keep going by fitting new AA NiCds into the HP battery drawer. Can't leave it on the charger too long or the batteries die. The programmable part no longer works, but. Cheers, Robert. -- _________________________________________________ Robert Stokes Scientific Officer School of Human Movement, Recreation & Performance Victoria University of Technology Ph 61 3 9688 4381 Fax 61 3 9688 4891 Robert.stokes(a)vu.edu.au

24 years, 6 months

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ID this Apple ][ Card

by mcguire＠neurotica.com

On September 27, Vintage Computer Festival wrote: > Onboard are several (6) 24 pin RCA packages marked CDM6116, which I > believe are ROMs. The rest is TTL. Hmm...the 6116 is a 2Kx8 static RAM. -Dave -- Dave McGuire Laurel, MD

24 years, 6 months

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ID this Apple ][ Card

by vcf＠vintage.org

I have a card with the only markings on it being Adaptive Peripherals. It's quite interesting. Onboard are several (6) 24 pin RCA packages marked CDM6116, which I believe are ROMs. The rest is TTL. It leads out to an external box with a centronics interface on it, a switch and LED, and two phono jacks. The switch in one direction seems to activate it, as when I turn on the computer with the switch in that position the LED lights and the system is frozen. The switch in the other position results in a normal boot. If I flip the switch while the system is on then it locks up. If I switch it back and then do a reset, the system resumes. Before I attached a monitor to it, it seemed to make the computer do something different. The normal "beep" when I turned the system on was replaced with a "boop". I finally hooked a monitor up but now the card does not seem to do anything. I hope I didn't fry it as when I was carrying it upstairs I plugged the dangling printer cable from the parallel card into the centronics interface in the external box to keep it >from swinging around. When I first powered it on it was shorting something as the power supply was cycling on/off. I turned it off quickly and unplugged the cable, then turned it on to hear the "boop" sound. So it seemed to be doing something weird until I plugged the monitor in to see what the heck was going on. It's in slot 4, so I checked the memory area at $C400 but there is nothing there. It also has a two AAA batteries on the back which I've taken out. They don't seem to affect the operation. I'm going to put two fresh batteries on to see what different it makes. I'm thinking this was an alternate ROM card, maybe for development or cracking games, although it seems to elaborate for the latter. Any ideas? Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org

24 years, 6 months

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test-drb September 2001