test-drb

test-drb@ccmp.vtda.org

101090 discussions

by bqt＠softjar.se

Patrick Finnegan <pat at computer-refuge.org> wrote: > On Monday 04 August 2008, Sean Conner wrote: > > > It was thus said that the Great Jim Brain once stated: > >> > > Tony Duell wrote: > >>> > > >No it doesn't, given that a PDP11 address to a program is always > >>> > > > 16 bits. The 18 or 22 bit phuysicall addresses were created by > >>> > > > the MMU. > >> > > > >> > > Did an MMU exist for the 8086? > > > > > > If such a think existed, it would have been an external circuit, > > > and would have been very hard to support since the 8086 did not > > > include support for restartable instructions (same situation on the > > > 68000). > > The PDP-11 doesn't support restartable instructions either. You don't > need restartable instructions to support an MMU, only to support > virtual memory type operations. For example, my Z80-based Altos 8000 > has a bank-switching MMU that could operate the same way as an MMU on a > 808[68] would. Actually, some PDP-11 models do support restartable instructions. Just not all of them. It requires the MMR3 register, which tells what modifications have been done to different registers before the instruction was aborted, so that you can back out of that, and then restart the instruction. Some PDP-11 models' MMU would also allow you to implement a virtual memory system, if you wanted to. It's just that noone did, and perhaps for good reasons. With only 8 pages, and way more physical memory than virtual, there isn't really much point in implementing a virtual memory system. But on an 11/70, it is definitely doable. Another example of the hardware designers implementing something that they didn't know was needed, but which could be done without much extra effort, so they did it, just in case someone would want to play around with it. But I think we've already established that the PDP-11 isn't brain damaged. :-) (Oh, and I agree with Tony Duells sentiment about the Intel brain damage. It's plain and simple just a question of not doing something one way when it was common knowledge at the time that that was the way to do it. NIH or just sheer lack of clues don't matter. It's brain dead all the same.) Johnny

17 years, 8 months

Free PDP-11 Stuff in Bedford, NH

by dbetz＠xlisper.com

I have a "PDP-11" that is actually a box (BA-23) that used to contain a MicroVAX I. I replaced the MVI boards with the following modules: M8190 KDJ11-B M7551-CF 4MB memory M7504 ethernet adapter M7555 RQDX3 hard/floppy controller M8043 DLV11-J 4 line serial It also contains the following drives: RX50 two 5.25" floppy drives RD54 159MB hard drive It seems to work. I was able to get RT-11 installed on the hard drive and the system boots to a prompt. I haven't played with it much since then though. I also have a bunch of other Q-Bus modules including a KDF11 CPU and some other memory and I/O boards as well as a few spare drives. Is anyone interested in coming to pick this stuff up? David

17 years, 8 months

Programming books looking for a good home

by ikvsabre＠comcast.net

Hi all, Programming Windows 95 - The Definitive Developer's Guide to the Windows '95 API (Petzold & Yao, 1996 Microsoft Press) Introduction to Graphics Programming for Windows '95 - Vector Graphics using C++ (Michael J. Young, 1996 Acedemic Press, Inc.) I figure $2 each plus shipping isn't too much to ask. Joe

17 years, 8 months

Need Toshiba T1200 manuals

by sellam＠vintagetech.com

I need any documentation I can get for the Toshiba T1200 laptop. This is a late 1980s era model (follow-up to the T1100/1100+/1000). I'm willing to pay up to $100 for them but need them within the next couple of days. Please call or contact me ASAP if you can help. 925/294-5900 office 925/216-0569 mobile Thanks! -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

17 years, 8 months

Free PDP-11 Stuff in Bedford, NH

by James＠jdfogg.com

> I have a "PDP-11" that is actually a box (BA-23) that used to contain > a MicroVAX I. I replaced the MVI boards with the following modules: > > M8190 KDJ11-B > M7551-CF 4MB memory > M7504 ethernet adapter > M7555 RQDX3 hard/floppy controller > M8043 DLV11-J 4 line serial > > It also contains the following drives: > > RX50 two 5.25" floppy drives > RD54 159MB hard drive > > It seems to work. I was able to get RT-11 installed on the hard drive > and the system boots to a prompt. I haven't played with it much since > then though. > > I also have a bunch of other Q-Bus modules including a KDF11 CPU and > some other memory and I/O boards as well as a few spare drives. > > Is anyone interested in coming to pick this stuff up? I'm very interested. I have a PDP-11/23, RL02's VT52's and a DECWriter. I'm always interested in related DEC PDP equipment. I'm located in Wilmot NH (outside New London).

17 years, 8 months

Faceplate or floor stand for DS20E

by bob＠jfcl.com

I got one of Guy's AlphaServers - it's actually a rack mounted DS20E that's working fine (thanks, Guy) but unfortunately all of them were missing their faceplates. I know it's a long shot, but does anybody have a faceplate for a DS20/DS20E, or better yet a set of the floor pedestal skins, that they'd part with? Thanks, Bob Armstrong

17 years, 8 months

Old computers available

by fire＠dls.net

Dear CC readers, I have decided to divest myself of a number of older computers. Some may be interesting to folks on the list. I live near Chicago, items can be picked up for free. Only item I may sell are the Q-Bus SCSI cards, the rest is available for free. S-100 machines free for pick-up Three dual 8" drive units One iOmega dual 8" Bernoulli cartridge disk system Three CompuPro System 8/16 chassis, One unknown S-100 chassis One chassis with power supply (no boards) Two empty chassis One large box of 8" disks, One medium box of iOmega Bernoulli cartridges, Several boxes of assorted S-100 cards, cables, documentation, IBM J30 with J01 expansion chassis This is an 8-way 75MHz PowerPC machine built around the MicroChannel bus HalStation 375 HalStation 385 with 3GB RAM Wang Word Processor Model 1220 Evans & Sutherland PS-390 MicroVax II Two KZQSA Q-Bus SCSI cards ($$$ make offer) Maxtor 190MB hard drive DEC RD53A drive DataTech CM6426 DEC RH12E drive TK50 tape drive TK70 tape drive Complete Apple IIc system CPU, color monitor Commodore 128D Four Commodore 64 Four Commodor 1541 drives TRS-80 Model I Technical Manual (578-2980090) TRS-80 Color computer Two TRS-80 Color computer II Two Apple II+ Two Apple IIe Several of the black Apple disk drives Complete Apple IIGS system One 3.5" drive Three 5 1/4" drives Cassette drive System Saver IIGS Apple IIGS Technical Reference Vol 1-3 Apple Pascal Learning Apple Pascal Apple IIGS Reference (binder) Apple IIGS Color monitor Keyboard, mouse, Other programming books and material

17 years, 8 months

Offer: Mac Color Classic box

by silent700＠gmail.com

That's right, just the box - the cardboard kind. This one's for the hardcore MacHeads out there. I've got a CC, which I'm keeping, and never had any packing materials, books, etc., but somehow I ended up with the box. It's in reasonably good shape, with various shipping/store labels on it, but not torn or stained. If anyone wants it, I can flatten it, put a label on it and send it USPS or whatever your favorite carrier is. Otherwise, out it goes... j -- silent700.blogspot.com Retrocomputing and collecting in the Chicago area: http://chiclassiccomp.org

17 years, 8 months

Stuff available in Lafayette, IN

by pat＠computer-refuge.org

I've got the following machines available, cheap for pickup in downtown Lafayette, IN, I'm asking for $10 each. I do not have the time to ship this, or drop it off anywhere. These will be scrapped in 2 weeks if they're not picked up by then. Aspect 3000 NMR vector computer (about 8U tall rackmount). Sun E4000 chassis, empty (2) Sun E450 (some parts in them, but not a full config) (2) Sun Ray 100, 17" CRT. Brand new, I have some keyboards and mice (7) Cisco 7000 router, including EIP, AIP, FIP, and fast serial cards. (2) Intel MDX 8" Hard disk drive AT&T 5620 terminal. No keyboards. (6) Motorola Information Systems 6300 (rebadged convergent) 68k UNIX system AT&T 3B2/310, probably needs a new hard drive (2) AT&T 6300, HDD and FDD. No keyboard or monitor AT&T 6300, 2 FDD. No keyboard or monitor Apollo Domain 3500. No keyboard/mouse or monitor. Untested SGI Octane (2) DEC AlphaServer 4100 Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

17 years, 8 months

Free HP 85B and accessories

by dbetz＠xlisper.com

I purchased an HP85B and a few accessories a while back and I've now come to the conclusion that I am not going to have enough time to do anything with it. I've verified that the HP85B itself works except for the tape drive. It has the sticky capstan problem and will need to be repaired. The printer seems to work though. The collection includes the following: HP85B ROM drawer 82936A with the following ROMs: - plotter/printer 00085-15002 - matrix 00085-15004 - advanced programming 00085-15005 I also have the following modules: HP-IB Interface 82937A Opt 001 Serial Interface 82939A 128K Memory Module 82909A Of course, it would be great to trade this equipment for something interesting. At the moment, I'm more interested in music synthesizers than in classic computers. I don't really expect anyone on this list to offer that sort of trade but if you just happen to have some old music stuff laying around that you don't want, I'd love to hear about it. In any case, I don't really want to pack this stuff up. I live in Bedford, NH and would be happy to give this equipment to someone who is willing to come here and pick it up. David

17 years, 8 months

TEST - do not read.

by tosteve＠yahoo.com

I told you not to.

17 years, 8 months

Discovering How Greeks Computed in 100 B.C

by vpmmviii＠prevelakis.net

For a more technical description of the mechanism you can also check: The Antikythera Mechanism: a Computer Science Perspective by Diomidis Spinellis at http://www.dmst.aueb.gr/dds/pubs/jrnl/2008-Computer-Antikythera/html/Spi08d… Regards **vp

17 years, 8 months

Major House Cleaning

by john＠guntersville.net

Time has come to clear out a major portion of the stash. At my age I will never get around to all of the projects. The following is a partial listing of what is available. I will add to the list as stuff emerges from the pile. Make offers, cash or trade. Pickup only in Guntersville, AL, USA. mVAX II (BA-23) several mVAX II (BA-123) several Vector 3 with mindless terminal DynaByte 8/2 with 8/4 drive box 2 ea. WellFleet (Bay) Router 3 ea. Micom Marathon 1K TI Travelmate LT-220 Hyperian portable PC HP Apollo 710 Atari 1041ST w/monitor Teletype model 43 various DEC Qbus card cages for PDP-11 power supply, blower and etc for RM-03 The following needs to go to someone that can make them available to the group. A lot of VMS gray wall books A lot of VMS orange wall books A lot of component (IC, diode, transistor) manufacture's data books

17 years, 8 months

Cool 1983 IBM System/36 system needs a home!

by dgreelish＠mac.com

The IBM System/36 was a minicomputer series marketed by IBM from 1983 to 2000, see - http://en.wikipedia.org/wiki/System/36 A local businessman contacted me about getting rid of his installation. I live just south of Jacksonville, FL, the machine is in Switzerland, FL - http://maps.google.com/maps?q=Switzerland%2C%20FL&ie=UTF-8&oe=utf-8&rls=org… He has a unit 5360, with a 5224 line printer, and two 5291 terminals. Here's some pics I found online - http://www.corestore.org/36.htm Please contact me directly if interested and I'll put you in touch. I do not subscribe to the list. Best, David David Greelish Classic Computing We fix Mac's and PC's! 904-537-5192 classiccomputing.com

17 years, 8 months

Can anyone identify this 9-track drive?

by derschjo＠msu.edu

I picked up an old 9-track drive and thus far I've been unable to identify what, precisely, it is. I have a couple of pictures at: http://yahozna.dyndns.org/scratch/9-track It has no manufacturer or brand information on it other than an "Interface Data, Inc." label on the front and a label on the back indicating that it is Model No. 9946. I can't find any information at all on the 'net going by this information. I'm guessing that it's a rebranded drive. It is a desktop unit, horizontally mounted and self-threading. As far as I can tell from examining it and fooling around with the front panel buttons it has a SCSI interface and does 1600 and 3200bpi. In the back of the unit are 5 slots, 4 of which are filled with cards. It appears to power up fine, but I can't get it to show up on the SCSI bus when hooked to a PC -- I don't know if the interface is broken or if there's some configuration I need to do. Any ideas? I'd like to find a manual for it so I can figure out what it can do and how to configure it. Thanks as always, Josh

17 years, 9 months

Free HP 85B and accessories

by gerhard.kreuzer＠liftoff.at

Hi David, I collect old computers and calculators and I have a hp85b, but no accessoirs. So I am interested, but, yeah, but I am not near, maybe, if nobody will pick it up, you may think about packing the stuf?? With best regards Gerhard

17 years, 9 months

Free HP 85B and accessories

by gerhard.kreuzer＠liftoff.at

Hi David, just forgotten, take a look at www.tuko.at[1] --> Computermusuem. With best regards Gerhard Links: ------ [1] http://www.tuko.at

17 years, 9 months

AOS "manual"

by slawmaster＠gmail.com

Hi all Just got my hands on the local library's copy of The New Hacker's Dictionary, 2nd ed (couldn't pass it up even though I've read it online), and I noticed that the entry for AOS mentions a joke manual called "How to Goad and Levitate your CHAOS System". Does anybody have a copy of this? Bitsavers? John -- Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn

17 years, 9 months

Anyone near Battle Creek, MI? I need some local help.

by legalize＠xmission.com

I'm trying to negotiate the sale of some rare E&S graphics gear, but the person is located in Battle Creek, MI and isn't willing to ship the item. Can someone help me out with transporting the item to the Craters & Freighters office in Detroit? I can paypal you money for your gas and time. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

17 years, 9 months

Fwd: [FG] WarGames: A Look Back at the Film That Turned Geeks and Phreaks Into Stars

by rtellason＠verizon.net

Looking at the image on the linked page, I'm wondering what kind of a dual drive setup that is. Mine doesn't look like that. ---------- Forwarded Message ---------- Subject: [FG] WarGames: A Look Back at the Film That Turned Geeks and Phreaks Into Stars Date: Thursday 24 July 2008 00:39 From: "Steve Gunhouse" <svgunhouse at woh.rr.com> To: "fidoguns at fidoguns.org" <fidoguns at fidoguns.org> <http://www.wired.com/entertainment/hollywood/magazine/16-08/ff_wargames> Was it really 25 years ago? -- Steve Gunhouse ------------------------------------------------------- -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

17 years, 9 months

HK ET-1000 Trainer

by silent700＠gmail.com

Looking for some advice on the ET-1000. I think Heath trainers were discussed here not too long ago. I have an opportunity to buy one locally for what I think is a fair price. While it would be nice to own as a relic, I'd like to actually use it as well (I intend to begin an electronics curriculum in the Fall.) It seems to have the features I'd need, and I'm assured it's working properly, but is too vintage to use regularly? Would I be better off just going with some Rat Shack kit? Thanks to all -- j

17 years, 9 months

Floppy controller Q - VCO Inhibit / VCO Sync, and IBM format

by ajp166＠bellatlantic.net

The 765 does the skip of index gap thing regardless of VCO connection an that is triggeerd off the index pulse. VCO inhibit is there to prevent the PLL from trying to track the the mistiming an index gap can introduce. Not always required and some VCO designs are better behaved. Allison > >Subject: Re: Floppy controller Q - VCO Inhibit / VCO Sync, and IBM format > From: "Chuck Guzis" <cclist at sydex.com> > Date: Tue, 29 Jul 2008 14:49:23 -0700 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 29 Jul 2008 at 20:55, Philip Pemberton wrote: > >> At the moment it's driven permanently high; this seems to work OK insofar >> as the sync detector (which is why the datasep is there -- to extract a clock >> signal for the MFM data stream) will pick up SYNC-A1 signals and the data >> seems to be valid. What I don't know is if this is how things are supposed to >> be done... > >ISTR (and it's been a long time since I read the document) that the >later versions of the 765 (765A?) imposes something like a 500 usec. >VCO inhibit after the leading edge of INDEX/. Earlier versions (765, >8272) imposed something like a 1000 usec. VCO inhibit. This can be a >real problem if the original disk was not formatted with an IAM, >leading to failure to recognize the IDAM for the first sector on the >track. > >Even so, the 500 usec. "blind spot" exhibited by the 8272A/765A can >be a problem for diskettes formatted on other systems where a too- >short gap occurs before the first sector header. This leads to all >sorts of dodges in reading them on PCs, such as taping over the index >hole or tweaking the drive spindle speed down a bit. > >WD controllers of the 17xx family did not do this; you could start a >sector very close to the index pulse and still be fine. > >My advice would be to fuggedaboudit, particularly if you want to read >diskettes produced on other systems than PCs. > >Cheers, >Chuck > > > > > >> >> The uPD765 and 827x datasheets are predictably rather sketchy on this >> front... All they really say is that the VCO line inhibits the VCO in the PLL, >> which would have the effect of allowing the PLL's loop filter to discharge, >> and reset it to a predetermined state. What they don't say is under what >> conditions the FDC will do that... >> >> So I guess the million dollar question is what I should do with said VCO line. >> Wire it to /INDEX via an inverter to reset the PLL on every rotation? Or just >> wire it to VCC (VCO enabled) and leave it? >> >> Thanks, >> -- >> Phil. >> classiccmp at philpem.me.uk >> http://www.philpem.me.uk/ >> >

17 years, 9 months

Teledisk archive format

by jules.richardson99＠gmail.com

Hi all, What's the current status as to the copyright and reverse-engineering of Teledisk's archive format? I have a feeling that someone was working on documenting the file format, but that the copyright is still owned by some company or other (not Sydex any more)? cheers Jules

17 years, 9 months

Floppy controller Q - VCO Inhibit / VCO Sync, and IBM format

by ajp166＠bellatlantic.net

> >Subject: Floppy controller Q - VCO Inhibit / VCO Sync, and IBM format > From: Philip Pemberton <classiccmp at philpem.me.uk> > Date: Tue, 29 Jul 2008 20:55:04 +0100 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Hi, > I've been playing about with the HDL code for the floppy reader (after a >"short break") and started thinking about how the VCO Sync/Inhibit line on the >data separator should be driven. > > At the moment it's driven permanently high; this seems to work OK insofar >as the sync detector (which is why the datasep is there -- to extract a clock >signal for the MFM data stream) will pick up SYNC-A1 signals and the data >seems to be valid. What I don't know is if this is how things are supposed to >be done... > > The uPD765 and 827x datasheets are predictably rather sketchy on this >front... All they really say is that the VCO line inhibits the VCO in the PLL, >which would have the effect of allowing the PLL's loop filter to discharge, >and reset it to a predetermined state. What they don't say is under what >conditions the FDC will do that... The VCO is allowed to hold at nominal freq during index gap. It's in the datasheet and a time after index. The VCO filter should not discharge but insead remain at niminal frequency rather than seeking phase lock. This is PLL 101. > >So I guess the million dollar question is what I should do with said VCO line. >Wire it to /INDEX via an inverter to reset the PLL on every rotation? Or just >wire it to VCC (VCO enabled) and leave it? The VCO line is an output from the FDC to the PLL. Some systems do not use it other use it as specified. Allison >Thanks, >-- >Phil. >classiccmp at philpem.me.uk >http://www.philpem.me.uk/

17 years, 9 months

AIX 3.2 Weird Networking Problem

by devonstopps＠gmail.com

Hi All, I've run into a problem with TCP/IP on AIX 3.2, hopefully someone can shed some light on this weird problem. I've used smit to configure the network - which works fine within the subnet. The gateway points at the building router (x.x.132.1), and, a netstat -rn returns this on the default route as well. But, no traffic gets out of the building. A traceroute shows the first hop is made to x.x.132.63, where it dies - a seemingly random PC, which is not in any configuration file on the system. Any ideas why this might happen? T.H.x. Devon

17 years, 9 months

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