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101090 discussions

ID UV erasable PROMS used on an IBM PC board?

by organlists1＠sonic.net

This is the CPU board out of a first generation 1982-83 IBM Electronic 85 Typewriter (Electronics Driven Selectric). I was looking to archive the software/firmware from these. The machine was exposed to some dampness. Corrosion has ensued on the interface connector between the CPU and driver boards. The next year, more energy efficient memory ICs were used. Memory power failure back up only consisted of 3 AA batteries and could last up to one year. The predecessor (this board) required 6 AA size Nicads and would only retain memory for a few hours. IBM using their apparently very large stock of OLD aluminum covered ICs in as many products possible I guess. Don Resor -----Original Message----- From: wrcooke at wrcooke.net <wrcooke at wrcooke.net> Sent: Sunday, March 20, 2022 7:13 PM To: D. Resor <organlists1 at sonic.net> Subject: Re: ID UV erasable PROMS used on an IBM PC board? > On 03/20/2022 8:59 PM D. Resor via cctalk <cctalk at classiccmp.org> wrote: > > > I cannot find a datasheet by any of the numbers silkscreened on these ICs. > > Could these be proprietary IBM P/N numbers? > > https://www.dropbox.com/s/f6rvemx9ldbbv5x/EPROMS1.jpg?dl=0 > > No need for a Dropbox account, close the login pop up and you can view > the image. > > Thanks > > Don Resor More details would help. What is the board? Do you know at what address in the PC memory map they fit? Based on the info you gave and the picture I would bet $1 they are standard 2764 chips. The 2764 was the first standard chip to have 28 pins. The size of the die visible through the quartz window is consistent with 2764 (as opposed to 27128 or 27256) and the fact there is room for 3 which would give 24K total. The PC didn't have a lot of places in the memory map that would allow more than 24K. Three 27128s would be 48K (a LOT in those days) and the 27256 would be 96K. I can't help with the part numbers. But I doubt they are IBM proprietary. The vast majority of chips used in the early PC line were standard from other companies. Will

4 years

ID UV erasable PROMS used on an IBM PC board?

by organlists1＠sonic.net

I cannot find a datasheet by any of the numbers silkscreened on these ICs. Could these be proprietary IBM P/N numbers? https://www.dropbox.com/s/f6rvemx9ldbbv5x/EPROMS1.jpg?dl=0 No need for a Dropbox account, close the login pop up and you can view the image. Thanks Don Resor

4 years

restoring a Silent 700 Model 765

by spectre＠floodgap.com

I found my old Model 745 in storage and other than needing a print head clean and adjusting the printer contrast, it works splendidly. It has the manual and I've got some plugs to build it an RS-232 connector when I find some more round tuits. This whetted my appetite for other 700s, including the (in)famous bubble memory 763/765. I was able to land a set of 765 ASRs. One of them came with Telenet transcripts from The Source (various logins from 1978 to 1980), which was really cool reading. I'll scan these. However, neither of them work. Both power on, but they immediately go into COMMAND mode and sit there, which appears to be abnormal behaviour based on what I'm reading in the service manual (thanks, Bitsavers!). The NUM LOCK switch works and the paper advance works, but nothing else appears to elicit a response. One of them advances the page and acts like it's printing the command prompt, but the other one doesn't even do that. The service manual suggests I need to replace both the TMS 9980 and 8080 boards, which would really suck. I'm hopeful that the one that's "more active" has a working 9980 board and I can use the 8080 board from the other one. (I haven't even gotten to the bubble memory yet.) Anyone repaired these units or have an idea of a repair strategy other than replace damn near everything? TELENET 303 8A TERMINAL= @C 301 24 301 24 CONNECTED DIALCOM NETWORK SYSTEM 10 -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- Simplicity is the ultimate sophistication. -- da Vinci ---------------------

4 years

restoring a Silent 700 Model 765

by spectre＠floodgap.com

>> 301 24 CONNECTED >> DIALCOM NETWORK SYSTEM 10 >> > Please do scan these! It is hard as hell getting info on The Source > and also on Dialcom! Yes, I definitely plan to transcribe them. There is potentially some copyrighted material here but I think I can just excerpt that and still include all the rest of the login process, etc. Still, would be nice to get the terminal itself working and see what's in the ASR's bubble memory, assuming that's still operational, so any ideas people have would be appreciated. -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- mouse, n: A device for pointing at the xterm in which you want to type. ----

4 years

General Data? Computer Equipment Auction - GSA

by mark.kahrs＠gmail.com

The LSSM is very interested in this machine for public display. It would complement the museum's collection of PDP-11s and other 16 bit machines.

4 years

LSSM is chasing this, was Re: General Data? Computer

by dave.g4ugm＠gmail.com

I missed a lot of this because g-mail decided to bounce some e-mails. I would like to make a couple of observations:- 1. Many real accredited museums have a smaller percentage of their artifacts on display than private collectors. In the UK both TNMOC and the Science Museum Group have large quantities of hardware that is not displayed. The science museum usually catalogues it but it is not really helpful if you can't see it. 2. All the private collectors I know are very happy to show and demonstrate what they have. It might not be catalogued so well but generally they want to show it off.... Dave G4UGM (Now feeling guilty because what I have is neither catalogued or on display)

4 years

IBM 5110 (5100) schematics ?

by bhilpert＠shaw.ca

Does anyone have or know whether the schematics for the IBM 5110 or 5100 are available? And the tightly related question of whether anyone has done ROM (ROS) dumps? There are some service manuals on bitsavers, they are field-service board-level manuals, mostly step-by-step problem resolution guides, no schematics. As a system, it's small enough to be reverse-engineered, in that regard it's tractable. However, it's implemented using IBM's mid-70s PCB and IC technology, increasing an RE effort by a couple orders of magnitude if not approaching impossible, unless one were to develop some robotic probing system and software. There was a 5110 on ebay, non-working, that a friend had some interest in. It was quite a gamble at the price, in the absence of real tech info. ... Apparently it's been delisted, so my question is just curiousity at this point.

4 years

WTD - Oregon/Taumetric M68000 Pascal and Cross Assembler (VAX/VMS)

by classiccmp＠philpem.me.uk

Hi all, Does anyone happen to have a copy of these squirrelled away? - Oregon Pascal M68000 -- cross compiler for VAX (or any other host platform). Probably called "P68.EXE" or something similar. - Oregon / Taumetric M68000 Cross Assembler for VAX (or any other). Probably called "MASM.EXE" or similar. - Oregon / Taumetric M68000 Linker for VAX (or any other). Probably called "MIL.EXE" or similar. The assembler and linker might be ports of Motorola's M68KMASM and M68KLINK -- so something equivalent which takes the Motorola-format .SA files and spits out .RO files should work instead. I've been tasked with getting some ancient code building again, and as usually happens, the "backup" is incomplete... Thanks, -- Phil. philpem at philpem.me.uk https://www.philpem.me.uk/

4 years

IBM 5110 (5100)

by organlists1＠sonic.net

Was the computer auction in question a 5100 or a 5110? Presently I see there is a 5110-C for sale https://www.ebay.com/itm/294865912729 There were also a 5110 with 8" external drives and a printer which sold: https://www.ebay.com/itm/304377532685 Don Resor

4 years

Does anyone/museum test disk packs?

by barythrin＠gmail.com

I was visiting a new thrift store and saw a disk pack they had. I joked that mine are just fun display/conversation pieces. Do the giant drives suffer the same head crash issues that a bad zip disk can do or are these safe if someone actually wanted to see what was on them?

4 years

Does anyone/museum test disk packs?

by jfoust＠threedee.com

At 08:25 PM 3/16/2022, John Herron via cctalk wrote: >I was visiting a new thrift store and saw a disk pack they had. I joked >that mine are just fun display/conversation pieces. Wait.... you bought it, right? Was it $2? - John

4 years

Commodore vic 20 poweroff

by bryce.diedrich＠intel.com

Just got a Commodore Vic-20. What is the safest way to power it off when I am done using it? Bryce Diedrich

4 years

VCF East 2022

by mloewen＠cpumagic.scol.pa.us

Exhibitors wanted! Deadline to apply is April 1. Exhibits are NOT limited to the shows two main themes. "Ever wonder about the roots of today?s technological society? Did you spend Covid nostalgically playing old video games from the past on an emulator? Do you want to get hands-on with computers ranging from the 1960s thru the early 1990s? Come to the Vintage Computer Festival East in Wall, NJ on April 22nd thru April 24th, 2022. On Friday, April 22nd, there are classes in everything from programming the Apple II computer to "learn to solder" sessions for both kids and adults. You can even solder together your own Intel based computer with our partner GlitchWorks. On Saturday and Sunday (April 23rd & 24th), join us for hands-on exhibits of vintage and classic computers along with talks from the people who were at the beginning of vintage computer history. Learn how vintage computers lead to today's world of technology becoming commonplace instead of niche hobby. This year we have two themes for our weekend talks: Women in computing and Computers for the Masses. Talks include a reunion of Commodore employees talking about their days working at Commodore Computers as well as the creators of the Commodore Vic-20 and C64. Talks by Margaret Morabito, the editor of RUN magazine. Learn the history of video game programming starting with the Atari 2600 to modern times with Burger Becky a long-time veteran of the video game industry. Consignment sales will be open all weekend where our members will be selling everything from vintage Apple to Zenith computers and everything in between, as well as parts for computers, peripherals, and other vintage computer equipment. Who knows, you may find the items to complete your nostalgic journey back to the 1980s. Will you find the personal and home computer that you have been looking for? Learn more about the Vintage Computer Festival East at https://vcfed.org/wp/events/vintage-computer-festival-east"

4 years

Vic-20 Power off.

by richardrpope2＠gmail.com

Diedrich, Just unplug it. I owned one for years. Thanks, Richard Pope

4 years

Seeking a MC75325L Dual Memory Driver

by pbirkel＠gmail.com

I have here in my hands a DEC H222A (16Kx18), part of a MM11-DP, that took a blow at sometime in the past. In consequence there are a number of small parts damaged (snapped diode, crushed axial electrolytic, chipped mica capacitor, cracked/broken SIP resister net) but those all appear to be relatively easy to replace. What's not so easy to replace is the MC75325L Dual Memory Driver (L = Ceramic) that was de-lidded in the process :-<. I am wondering whether anyone has one of these ICs in their spare parts drawer that I could acquire? I do see a MC75325P (plastic) on eBay at littlediode_components for ~20USD, plus a surprisingly modest shipping charge (Royal Mail International). UTSOURCE claims to have a supplier of the ceramic part "new", with a significantly higher shipping charge. Before I go with the ceramic part (IMO not the sort of packaging that gets . remarked) I thought that I would check here for alternative sources. Thank you, paul

4 years

Found! Ge 115 computer brochure

by couryhouse＠aol.com

Found! Ge 115 computer brochure where can I find the computer? Sent from the all new AOL app for Android

4 years

Interface for a HP 712 workstation - A2263-66536

by jesse＠cypress-tech.com

This is a long shot but would anyone have an interface card for a HP 9000 712 HP-UX workstation. The part number is A2263-66536 and its a LAN card.. If anyone has one that they want to sell, let me know. Thanks Jesse Cypress Technology Inc jesse(at)Cypress-Tech.com

4 years

gcobol

by paulkoning＠comcast.net

Saw a note on the GCC list that I thought some here might find interesting: it announces the existence (not quite done but getting there) of a COBOL language front end for GCC. Interesting. For those who deal in legacy COBOL applications that want a more modern platform, I wonder if this might be a good way to get there. Run old COBOL dusty decks on Linux, yeah... I wonder if I can make build that front end with the pdp11 back-end. :-) paul

4 years

Front Panels

by rodsmallwood52＠btinternet.com

Hi ????? I've just done an inventory and I have the following stock ?????? PDP-8/e Type A? Qty 4 ??????? PDP-8/e Type? B Qty 5 ??????? PDP-8/f?????????????? Qty 4 ???????? PDP-8/i?????????????? Qty 8 ???????? New production may not be for a while. Rod Smallwood

4 years

cctalk Digest, Vol 90, Issue 7 - Re: DEC H500 Digital Computer Lab

by gerhard.kreuzer＠liftoff.at

Hi, I also have an H500 waiting for restoration. Maybe anyone can give better winfos about the plugs/connectors of the patch cables. I didn't have any, I have to make new. With best regards Gerhard Zitat von cctalk-request at classiccmp.org: > Send cctalk mailing list submissions to > ? ? ? ? cctalk at classiccmp.org > > To subscribe or unsubscribe via the World Wide Web, visit > ? ? ? ? http://www.classiccmp.org/mailman/listinfo/cctalk > or, via email, send a message with subject or body 'help' to > ? ? ? ? cctalk-request at classiccmp.org > > You can reach the person managing the list at > ? ? ? ? cctalk-owner at classiccmp.org > > When replying, please edit your Subject line so it is more > specificthan "Re: Contents of cctalk digest..."

4 years

Text art (Was: Found! Ge 115 computer brochure

by cisin＠xenosoft.com

more like this: (Who needs VGA, if you have a non-proportional font?) (Text art, with a proportional font, is psychedelic) ____________________________________ ______________ |------|------| __ __ __ | ___________ | () | | 64X4 | 64X4 | || | | | | | | | | | | ___| |------|------| || | | | | | | |____| |____| || D | | 64X4 | 64X4 | || |__| |__| |__| ________________ ||| I | |------|------| | ________ ______ ______ | ADV476KN50 | ||| P | | 64X4 | 64X4 | |TRIDENT | |______| |______| | 1-54BV 8940 | ||| S | |------|------| || |TVGA | |______| |______| |________________| |||___| | 64X4 | 64X4 | || |8800CS | ________________ ___| |------|------| || |11380029| LOW->| /\ SUPER VGA | _________ | | | 64X4 | 64X4 | -------- BIOS | \/ (1) ||_________| | 1 | |------|------| || ______ J ______ |________________| _________ | 5 | | 64X4 | 64X4 | || |______| 2 |______| ________________ |_________| |___| |------|------| || ________ ______ | /\ SUPER VGA | ___| | 64X4 | 64X4 | |________| |______|| \/ (2) | _________ | | |------|------| () HIGH->|________________| |_________| | 9 | | 64X4 | 64X4 | ________ _________ _____________ _________ | | |______|______|__ |________| |_________| |_____________| |_________| |___| | __ TVGA-1623D _ () | |LLLLLLLLLLLLLL| |LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL| |___| | |

4 years

DECmate II disk image tooling?

by david4602＠gmail.com

I have some disks that look like they're from a DECmate II computer, standard RX50K drives. The disk images all look like they're a mix of 12-bit (OS/78 or OS/278?) and 8-bit all on the same media. I can't convince PUTR to make sense of the images, so I'm wondering if there is anything else out there that is likely to be able to examine the disk contents? I'm really looking for PUTR-like functionality to list and copy files. Maybe SIMH could be configured to be a DECmate II and be fed the disks? I have a couple of disk images available in case anyone wants to try them out - they're purported to be "DECmate II CP/M 2.2 version 2.0" and "System Disk ver. 2.0 8/24/87": https://drive.google.com/drive/folders/1PD0TlUPiT7MIPEX6abEn33e7s3kSXp_H?us… - David

4 years

General Data? Computer Equipment Auction - GSA

by skynet＠wans.net

Found an interesting item for bid on GSA auction site if anyone interested. Reminds me of General Data equipment... https://gsaauctions.gov/gsaauctions/aucitsrh/?sl=31QSCI22048010 Sorry, link did not send correctly on first try. Stan Irwin

4 years

General Data? Equipment Auction - GSA

by skynet＠wans.net

Found an interesting item for bid on GSA auction site if anyone interested. Reminds me of General Data equipment... EQUIPMENT RACKS | | | | EQUIPMENT RACKS One lot consisting of: 2 Equipment Racks with the following built in: recorder, processors, disk drive units,... | | | Stan Irwin

4 years

Looking for computer and individual to read old floppy disks

by tcoxjoseph＠aol.com

Dear Classic Computers Members,I am looking for someone who had an operating floppy disk drive that can read old 5-1/4" floppy disks from the 1980s.I may also need someone to read hard, 3" floppies.?The disks can be mailed and the info can be saved as text and sent via email or to the Cloud.I would need a price estimate, as well. I live in Virginia.Thank you in advance.Terry Joseph

4 years

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