test-drb

test-drb@ccmp.vtda.org

101090 discussions

by cclist＠sydex.com

I have a power transformer that I scavenged out of a 15-year old UPS, so it's probably pretty close to being on-topic. At any rate, I want to use this transformer in a DC power supply. I have three sets of windings: two sets are 120/240v "universal" series/parallel type and the third is 24-0-24v center-tapped. I want to run this from 120vac. Is there any benefit to paralleling the two sets of 120/240v main windings (i.e. 4 120v windings in parallel)? Will it increase the power rating of the unit or is that mostly a function of the secondary winding? Suppose instead of 24-0-24 on the secondary, I'd like 12-0-12. Obviously, one way to get this is to hook the primary (-ies) up as 240v. Is there any benefit to be gained in parallelling the two 240v primaries? Thanks, Chuck

19 years, 9 months

sunos install docs?

by brad＠heeltoe.com

Does anyone have sunos install docs for 2.0, 3.5 or 4.0 on a sun2? for grins I tried the sun2 emulator with the sun2 tape images I found. I made some guesses about copying the miniroot to the swap parition but could find no joy. (that's a joke, heh, with appologies to bill) I could get the 2.0 tape diags to run and put a label on the disk but running the standalone copy to copy the miniroot to the swap (which I assume is sd(0,0,1)) did not allow to boot - it just took an exception. none of the other tape images (3.5, 4.0) seemed to work. the boot would run but the standalone copy an diags would crash. -brad

19 years, 9 months

z180, z2780, z380 was: Re: Modern CP/M machine classic?

by ajp166＠bellatlantic.net

> >Subject: Re: z180, z2780, z380 was: Re: Modern CP/M machine classic? > From: "e.stiebler" <emu at e-bbes.com> > Date: Tue, 05 Sep 2006 07:13:48 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Allison wrote: >> The Z280 was used on the YASBEC (Yet Another Single Board Computer) and a few >> others that slip my mind. >Pictures I found, show an z180 on the YASBEC :( >The comp.os.cpm FAQ says it is a hd64180 ... >(which we used here to drive a 82768 intel graphics processor) >Was there a z280 version too ? There were really many Yasbc(s). ;) Yes, it was described in TCJ years ago. It was on eurocard with their nice connectors. I have one I did using a section ISA16 bus and ISA 16 for IO, DISK and herc mono video. It was a hexperiment. ;) Allison

19 years, 9 months

Siemens-Nixdorf S400 diskpack, info request

by aek＠bitsavers.org

> I need information about a disk unit Siemens-Nixdorf S400. To what level of detail do you need? The early S400 series were rebadged RCA Spectra 70's It is probably similar to either IBM 2311 or 2314.

19 years, 9 months

Minimal KDJ11 system

by dbetz＠xlisper.com

I am about to drastically cut back on my collection of PDP-11 hardware. After giving away everything on the list posted in another message, I will have the following QBus boards left: M8192 (KDJ11-A) M8059KF (128KW RAM, two) M8047CA (boot, serial, RAM) What I'd like to do is find a small QBus backplane and power supply that will accept these four cards and then use the TU58 emulation software to boot RT-11 over a serial link to a PC. I understand that this will be slow but most of my work with PDP-11s so far has been with the PDT-11/150 and its floppy drives are very slow. Maybe I'll feel right at home! In any case, does anyone have a small QBus backplane and power supply that they are willing to sell or trade?

19 years, 9 months

OT/OT Software??

by jim.isbell＠gmail.com

I am cleaning up and found some old software on 5 1/4" floppies. I was going to put it on Ebay but occured to me maybe someone on this list would be interested in it. But I am almost afraid to speak since it may be Off Topic? Jim Isbell "If you are not living on the edge, well then, you are just taking up too much space."

19 years, 9 months

Cops need C64 help?

by mouse＠Rodents.Montreal.QC.CA

Friend of mine tossed this URL my way. > http://www.guardian.co.uk/austria/article/0,,1865500,00.html Any C64 people in Austria who may be able to help? /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

19 years, 9 months

Data General AV/10000 worth saving ?

by dm.hunt＠ntlworld.com

I've heard from an NHS (UK public health) source that a Data General AV/10000 is to be scrapped sometime in the next six months. The guy laughed and choked at the list price, ?795,000 ... As far as I can ascertain, it has 32 x Motorola 88000 processors, a huge SCSI disc array and a lot of RAM (could mean anything) and runs a flavour of UNIX. But the whole thing has gone cranky (a technical term ?) and with NPFIT (National Programme For Information Technology) (a ?37 billion government IT project looked set to replace all IT in the NHS) the DG box will become redundant next year anyway. Is it worth rescuing ? Bear in mind I would probably have to pay the equivalent scrap value. It also sounds quite big too, I can't find any idea of the size on Google... There is also a AV/25000 going end of next year, I think that is too new for this list though (PIII Xeon), plus it's probably outside of my price range... Dave ;)

19 years, 9 months

[Fwd: Re: 11/64 conversion]

by bqt＠softjar.se

joe heck <trash3 at splab.cas.neu.edu> wrote: > Folks, I asked similar questions directly and got the following answers. > So, don't know if it is RT, RSX, or RSTS, or even a flavor of Unix. > > Joe Heck Hmm. Noone seem to ask the most obvious questions... The original poster said it was a HP PDP 11/64. Now, HP never made any computers with a PDP moniker, Digital did. And Digital never made a PDP computer with the 11/64 designation. I would suggest that we start at that end. What machine is this *really*? As for questions about transferring the data... Is the machine still functional or not? If it is, then it would obviously be easiest to just type the file out (it's a text file after all). Size of disks (someone asked). If we're talking MSCP disks, the largest I know of is the RA73, which weights in at 2 GB. (Unless you want to count SCSI drives...) Copying to a Linux system? Sure you can do that, but I wouldn't. VMS would probably be way better if it's actually from some PDP system, since VMS can actually read some of the file systems it might be in then. But this might be something not at all related to DEC equipment after all... Johnny

19 years, 9 months

PDP8 and Z-machine engine

by bqt＠softjar.se

woodelf <bfranchuk at jetnet.ab.ca> wrote: > Johnny Billquist wrote: > >>> However, have you ever programmed on a PDP-8? >>> If so, you would realize that it really requires you to do things a bit >>> different from what people nowadays do. >>> You have 4K word pages. One word is 12 bits. The addressing style of >>> instructions really limit most routines to what you can fit into 128 >>> words. No stack... > > >Well 12 bits holds 2 6 bit chars nicely :) >I suspect the best way to do this is to convert Z-machine >data into something better suited for 12/24 bit processing. Hmm, I'm not sure how easy it would be to convert the game files in a way that would be good here... Text data would be nice to change, but other stuff you'd want to keep the way it is. But this would cause stuff to move around, so you'd really get into trouble. Nah, I suspect you'll want to leave the game files as they are... >>> Well, there are a lot of things to play around with. >>> Like I said, it wouldn't be difficult to write a Z-machine interpreter >>> for the PDP-8, but you'd better not base it on something written in C. >>> You might pick an idea or two from Frotz, for instance, but you'd have >>> to rewrite that as well to fit with the PDP-8. > > >Well the PDP-8 is easy to program in -- 8 instructions types. :) Depending on how you look at it, yes. You have six instructions that have an address argument, one I/O instruction, and one operator instruction. But the IOT leaves most of the bits free for interpretation by the device, and the OPR instruction is bit-coded, so it's really a lot of instructions. >>> And you have almost no OS to support you either, so you'd have to >>> implement the I/O as well, and figure out which, if any, clock you have, >>> if you want to implement timed input. > > >Oddly you have better OS support now with the emulators and >some new-ish hardware that uses ide drives. Huh? What are you talking about? You'll still have the emulator running OS/8, and nothing else. (Well, you could write it for RTS-8 for a different environment with support for more hardware, but I doubt anyone would to that.) OS/8 is a very limited OS. Whatever underlying hardware you use is irrelevant. It's all a question of what you're emulating, and I would recommend that your code works on atleast a few different combinations of hardware. Johnny

19 years, 9 months

Resistors

by wdonzelli＠gmail.com

I have a vaguely sorted pile of 1/4 and 1/8 watt carbon comp and metal film resistors available for postage plus a token amount for my time. The pile is about two pounds. Any interest? Replies off list, please... -- Will

19 years, 9 months

SunOS Install docs

by compoobah＠valleyimplants.com

Brad asked about SunOS2. I have no documents for that release, but SunOS 4s recommended install proceedure bypasses standalone copy in favor of MUNIX and dd. To load MUNIX you run >bst() Boot: st(,,4) which loads MUNIX into ram. From there, you make devices, if necessary, run format to label your disks, and then dd the miniroot off with mt -f /dev/nrst0 fsf3 dd if=/dev/nrst0 of=/dev/rsd0b bs=48k you boot the miniroot with b sd(,,1) -sw Standalone copy syntax is >b st() Boot: st(,,2) Copy from: st(,,3) Copy to: st(,,1) then reset and boot miniroot.

19 years, 9 months

HP 2934A Printer Manual Needed

by technobug＠comcast.net

Cleaning house and came across said printer. Appears to work great and has an RS232 interface. However I really need the owners/ programming manual to make use of it. CRC

19 years, 9 months

Stuff available in NH

by dbetz＠xlisper.com

I'm cleaning out my basement and am finally admitting to myself that I'm not going to have enough spare time to make use of all of the equipment I've accumulated over the years. I would like to offer the following list of equipment to the list. Some of the items are too large to pack and ship. I would like them picked up in Bedford, NH 03110. This includes all of the PDP-11 equipment and the Sun 386i workstation. Some of the other stuff could be packed shipped at the new owner's expense. I'm basically offering this stuff for free to anyone who wants it. The only thing I would be interested in acquiring in trade is an LK201 keyboard and a VR201 monitor to use with my DECmate III+. Even that might be available after I've had a change to play with it a little. Anyway, here is the list. Please contact me at dbetz at xlisper.com if you are interested in any of this equipment. Thanks, David Betz

19 years, 9 months

z180, z2780, z380 was: Re: Modern CP/M machine classic?

by ajp166＠bellatlantic.net

> >Subject: z180, z2780, z380 was: Re: Modern CP/M machine classic? > From: "e.stiebler" <emu at e-bbes.com> > Date: Mon, 04 Sep 2006 17:38:17 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >David Griffith wrote: >> I was wondering if a recently made machine intended to be used as a >> "classic" computer qualifies as a "classic" here. Here are some examples: >> >> P112: A Z180 single board computer still available brand-new which runs >> ZSDOS and probably straight CP/M too. > >Were there any SBCs with the later z280 & z380 chips ? >A short google search didn't find anything. So, anybody here knows of >any SBC with the z280, z380 (or similar ?) chips ? Never saw a real Z380. However I have several Jrev Z280s in CP/M based projects. The Z280 was used on the YASBEC (Yet Another Single Board Computer) and a few others that slip my mind. Allison

19 years, 9 months

Modern CP/M machine classic?

by dgriffi＠cs.csubak.edu

I was wondering if a recently made machine intended to be used as a "classic" computer qualifies as a "classic" here. Here are some examples: P112: A Z180 single board computer still available brand-new which runs ZSDOS and probably straight CP/M too. Replica I: An Apple I clone with modern parts replacing the discontinued parts of the original SBC1620: Uses the Harris 1620 CPU to create something roughly equivalent to a PDP8e. An optional near clone of the PDP8e front panel is/was also available. Has an IDE port to use modern hard drives or CF cards for storage. Other machines to consider are completely new, but are designed and built with classic computing in mind. Specifically I mean the half-dozen or so machines built from discrete TTL chips. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

19 years, 9 months

z180, z2780, z380 was: Re: Modern CP/M machine classic?

by ajp166＠bellatlantic.net

> >Subject: Re: z180, z2780, z380 was: Re: Modern CP/M machine classic? > From: David Griffith <dgriffi at cs.csubak.edu> > Date: Mon, 04 Sep 2006 17:03:50 -0700 (PDT) > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On Mon, 4 Sep 2006, e.stiebler wrote: > >> David Griffith wrote: >> > I was wondering if a recently made machine intended to be used as a >> > "classic" computer qualifies as a "classic" here. Here are some examples: >> > >> > P112: A Z180 single board computer still available brand-new which runs >> > ZSDOS and probably straight CP/M too. >> >> Were there any SBCs with the later z280 & z380 chips ? >> A short google search didn't find anything. So, anybody here knows of >> any SBC with the z280, z380 (or similar ?) chips ? > >I've been pondering a redesign of the P112 for a while. I'll probably >investigate using a z280 or z380 for a brand-new design. The biggest problem doing a Z280 design is finding enough late rev Z280s. The z280 in it's early revs had a number of bugs that impacted the MMU and cache. However, if you find enough parts it's a interesting varient of the z80 line with a 16bit wide data bus, 24bit addressing, MMU and I&D space. It's instruction set is enhanced as well. Despite all that it's fully Z80 upward compatable and will run most z80 binaries found in the Z80 CP/M world. FYI: fast parts are in the 12.5 to 16mhz range. Allison

19 years, 9 months

PDP8 and Z-machine engine

by bqt＠softjar.se

Christian Corti <cc at corti-net.de> skrev: On Sun, 3 Sep 2006, Johnny Billquist wrote: > > > No, you'd just have to write it from scratch. Nothing strange about that, and > > > doing something about V4 and V5 games isn't that difficult either. Given a > > > little time I sure could whip one together, but for now I'll leave the > > > exercise to someone else. > > > I've already written one Z-machine interpreter in MACRO-11. It deals with > > > anything V1 to V8, except for obvious limitations (no sounds, no graphics, no > > > mouse...) > > There I completely disagree! I've ported the Z-machine interpreter from > InterTaskForce (written in C, and really good if you want to understand > how the interpreter works) to the IBM 5110 (written in PALM assembler), > including paging etc. But until now nobody else has ever wanted to try it > on his 5110/5120... Seems all 5110 owners don't want to use their machines. :-) However, have you ever programmed on a PDP-8? If so, you would realize that it really requires you to do things a bit different from what people nowadays do. You have 4K word pages. One word is 12 bits. The addressing style of instructions really limit most routines to what you can fit into 128 words. No stack... Well, there are a lot of things to play around with. Like I said, it wouldn't be difficult to write a Z-machine interpreter for the PDP-8, but you'd better not base it on something written in C. You might pick an idea or two from Frotz, for instance, but you'd have to rewrite that as well to fit with the PDP-8. And you have almost no OS to support you either, so you'd have to implement the I/O as well, and figure out which, if any, clock you have, if you want to implement timed input. Johnny

19 years, 9 months

Vacuuum tube digital circuits (50 year rule)

by swtpc6800＠comcast.net

I recently got a book titled High-Speed Computing Devices 1st ED. 1950. This is a design survey of how to build an electronic digital computer and has schematics of gates, adders and accumulators done in vacuum tubes. At the time there were around 10 working computer in the U.S. I have been adding to my magazine scans. I found a decade counter circuit implemented with four 12AU7 tubes (dual triodes) in the October 1955 Radio & Television News. (50 year rule.) http://www.swtpc.com/mholley/ElectronicsWorld/Oct1955/RTVN_Oct1955.htm It is almost the same circuit Don Lancaster implemented with RTL ICs in the February 1968 issue of Popular Electronics. http://www.swtpc.com/mholley/PopularElectronics/Feb1968/PE_Feb1968.htm Michael Holley www.swtpc.com/mholley

19 years, 9 months

Apple SCSI

by THX1138＠dakotacom.net

Hi, I want to move my scanners over to one of these Macs (probably the 840AV since I can also exploit the video capabilities thereof). But, it's got those wacky DB25 SCSI connectors. :-/ I have DB25-Centronics cables. And, DB25-HD50 adapters. The scanners have a hodge-podge of *different* connectors (sheesh! talk about "standards"... :< ). I assume a good goal is to minimize *connections* wherever possible. So, instead of DB25-HD50 adapter to HD50 cable, use DB25-HD50 cable, if possible. But, I'm nervous about the DB25's and their roles in all this. Is this just a regular SCSI (narrow, SE) bus with a few less returns? Or, are there other consequences of this connector choice? E.g., how much grief can I expect going *through* the slide scanner with DB25 coming in and Centronics going out? Is this just effectively a "DB25-Centronics" adapter with a device tap in the middle? Thanks! --don

19 years, 9 months

Stuff available II

by djg＠pdp8.net

Since TI 340 stuff was was people were most interested in there are also some TI 32010/20/C30 manuals in the pile. Those are the earlier DSP chips. Let me know if I should grab them. Same you pay shipping from 20817

19 years, 9 months

Want: Sun-2 System

by aek＠bitsavers.org

> Looking for a Sun-2 system for vintage apps. Someone at MIT wrote a Sun-2 simulator. http://theory.lcs.mit.edu/~fredette/tme/

19 years, 9 months

Transformer question (only slightly OT)

by aliensrcooluk＠yahoo.co.uk

--- Tony Duell <ard at p850ug1.demon.co.uk> wrote: > > My father built himself a board which was simila r > but more elaborate: > > he could select among (1) a small (7.5W?) light > bulb, (2) a large > > (100W?) light bulb, (3) a high-wattage heating > element that was still > > under the breaker trip current for that mains > circuit (an iron, I > > think), or (4) no limiter at all. > > Another useful limiter (to repleace (3) in your > setup is a 1000W tungsten > halogen bulb (e.g. one of those 'security lamps'. > They're pretty cheap > now). > >> snip << > > -tony > Tungsten bulbs cheap??!!!! The ones we have to buy for equipment at our lab cost like ?500 (GBP). Regards, Andrew B aliensrcooluk at yahoo.co.uk

19 years, 9 months

[Fwd: Re: 11/64 conversion]

by brad＠heeltoe.com

If the disk will spin up, and it has a unibus interface, like a UDA-50, then i would move it to a working 11/44, boot up unix and make an image copy of the disk and then copy it over the network to a linux computer. no doubt a skilled vms person could do the same with vms. (because, well, how big could the disk image be? :-) Or you could jam a unibus scsi card in and copy an image of the disk to a JAZZ drive. Once the image is on a linux machine you have (as we all know) a large number of forensic tools... Not the least of which is simh, which you could possible use to boot the original os. Worst case you should be able to extract files from the file system with putr or other tools. heh. send me the disk and I'll take a crack at it. I think we need a picture of the disk drive to identify what it is. (and here's to hoping it's not an RP or RM drive :-) -brad

19 years, 9 months

commodore 64/128 question

by dgreelish＠mac.com

On Sep 1, 2006, at 11:23 PM, cctalk-request at classiccmp.org wrote: > Date: Fri, 1 Sep 2006 18:21:11 -0700 (PDT) > From: "Zane H. Healy" <healyzh at aracnet.com> > > My personal advice, get a C64, or maybe a C64c, skip the C128. I'm > saying > this not because I have anything against the C128, but because it > will be > different from what you remember. Plus as has been pointed out, it > does > take up more desktop space. > > My "fondness" for the VIC-20 has been replaced with a "fondness" > for the C64 > (a machine I hated when I was using the VIC-20, which was through > mid-1986). > I really want to setup my one nice C64 system, I mean I *REALLY* > want to set > it up. Unfortunatly I don't have the space, and truth be told, the > time. I > also really want to setup an Apple // of some sort, most likely a // > gs, but > there is the same problem. > > I need to find a really good excuse to set up one or the other, and > so far I > haven't found one. > > Zane I agree with this, the C64 or a 64C (I had both) represent the height of Commodore 8-bit, though I have always wanted a 128D. There are supposedly "mint" in box examples of these on eBay right now. VIC-20 too. The 128 does have the Z-80 for CP/M though, if that interests you. David DavidGreelish classiccomputing.com The Home of Classic Computing Podcast and Computer History Nostalgia

19 years, 9 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb