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TRS 80 Model 1 Power Supplies - Repair |
Ohio Scientific Superboard IIby billdeg Total messages in this thread: 1  The 1979 Ohio Scientific Model 600 CPU rev B, known as the Superboard II. Click image for more pictures.
Initiated project, photos taken for closeup view of chips and board.">... [ read more ]
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Vintage Computer Festival MW 2010by billdeg Total messages in this thread: 1 Photo Highlights  The highlight of the Vintage Computer Festival Midwest was the XEROX Alto-II XM computer system. The XM stands for extended memory. Click image for the picture set.
 This was actually a dual festival, co-sponsored by the Emergency Chicago Commodore Club. Click the image to see pictures of the Commodore and Amiga systems from the event. More photos..http://lyonlabs....-2010.html
The Glenside Color Computer Club was present:
http://www.glensideccc.com/
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CompuPro System Support 1by billdeg Total messages in this thread: 5 Updated: [ SS-1 Card Repaired, Replaced -16V fuse ] 09/12/2010 My CompuPro System Support 1 card is on the fritz, but I am working to fix. The signal is being received from the terminal but I can't see the text on the screen, nothing is returned through the IO card. My first guess is that the 1488 or 1489 chips are bad. Swapping did not fix. I checked the voltage regulators. The 7912 in position U2 is not getting the expected voltage. I replaced the 7912 to no improvement. I think now maybe the tant cap in position C3 (or maybe C4) is bad. There are four such caps on the board C3, C4, C7, C8. The manual says that these tant caps are supposed to be 6.8uf 35v tant caps, but when I check the actual caps on the board they're all marked +1.5 25V Now I need to decide whether to trust the manual or use +1.5 25V instead because that's what's there, and it worked for apparently many years that way? ">... [ read more ] |
TRS 80 Model III VR Data Disk IIIby billdeg Total messages in this thread: 1  TRS 80 Model III 26-1061 with a number of upgrades including a VR Data Disk III kit
This computer is not pretty, but it has a lot of interesting modifications. The Model 26-1061 is the first of the TRS 80 Model III's, and believe it or not these systems shipped with BASIC level 1. I am not sure if this system's ROMS have been upgraded but I am guessing yes.
This system has the following upgrades:
1) VRdata Disk III (Tandon TM-100-1A SSSD drives, and what I believe is an external drive port
2) Internal speaker kit
3) Parallel printer kit
4) RS232 kit
5) I/O port
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VCF MW 2010 - The SIGby billdeg Total messages in this thread: 1 My exhibit for the Vintage Computer Festival will be titled: The SIG The computer hobbyist special interest group, or "SIG", became prevelent in the later 1970's as the original homebrew computer clubs fragmented into smaller groups. These groups comprised of like-minded persons dedicated to a particular computer system or manufacturer, but there was often less of a focus on hardware or the computer engineering process that had dominated earlier groups. These SIGS sometimes broke off completely from their parent group to form their own independent clubs. Whether independent or part of a larger organization SIG's held monthly meetings, published articles, newsletters, and ran manufacturer-centric bulletin board systems. Product-centric groups served as an important communication tool, a software library, a knowledge base, and the source of innovation. Often these groups continue">... [ read more ] |
August Workshop Photosby billdeg Total messages in this thread: 1  Repair Workshop at the Wilmington Hackerspace. Matt (foreground) working on a PDP 11/05 to generate I/O using the console, and Alex (rear) working to attach a 3.5 disk drive to a Heathkit H89 computer. Click image for larger picture
 Local Tandy expert Fred M. dropped off a huge lot of Tandy III and 4-era systems, drives, software, and docs. Some of these items are for sale. Can you find 9 Tandy computers in this picture? Click image for larger view.
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Microcomputer Manufacturers 1979by billdeg Total messages in this thread: 1 Allied Computers B-58 Ashok Nagar Madras 600 083 India Altos Computer Systems 2378 B Walsh Av Santa Clara CA 95050 Andromeda Systems 17875-N Sky Pk North Irvine CA 92714 APF Electronics Inc 444 Madison Av New York NY 10022 Apple Computer Co 12060 Bandley Dr Cupertino CA 95014 Atari Inc 1272 Borregas Av Sunnyvale CA 94086 Central Data POB 2484 Station A Champaign IL 61820 CGRS Microtech POB 368 Southampton PA 18966 CMC Marketing Corp 5601 Bintliff Suite 515 Houston TX 77036 Commodore Business Machines Inc 901 California Av Palo Alto CA 94304 Comptronics 19824 Ventura Blvd Woodland Hills CA 91364 Compucolor Corp POB 569 Norcross GA 30071 Computer Data Systems 5460 Fairmount Dr Wilmington DE 19808 Computer Power and Light 12321 Ventura Blvd Studio City CA 91604 Computer Products of America 633 W Katella Av Orange CA 92">... [ read more ] |
Toshiba T3200SXby billdeg Total messages in this thread: 1  This is a Frankenstein Toshiba T3200SX, built from three separate systems. I still need to replace the internal battery, but it works great. I maxed out the RAM.
More Pics">... [ read more ]
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A new S-100 Serial IO Boardby monahan_z Total messages in this thread: 1 For people interested in building/repairing S-100 systems Andrew at N8VEM and I at S100Computers.com have just completed a prototype of a new S-100 Serial IO Board utilizing a Zilog Z85C30 UART. The board also has a V-Stamp voice synthesizer and DLP USB port controller and two parallel ports (8255). If you would like to read about this board please look here:- http://s100com...IO%20Board.htm There is a growing list of people getting interested in these S-100 systems. We get these bare boards produced in batches (typically $20-40, depending on demand). So if you would like to be kept in the loop as this board evolves you need to contact Andrew or me. ">... [ read more ] |
The Last HOPE 2010 July 16-18 NYCby billdeg Total messages in this thread: 1  The Last HOPE - Hackers on Planet Earth convention
I arrived Friday night to check out a preview of Jason Scott's new video, "Get Lamp" which was shown at 11PM in the Tesla room that night.
GET LAMP: http://www.getlamp.com/
Jason really has a talent for production and his interview format makes for a very effective documentary. "Get Lamp" is about text adventure games and the preview segment he chose to show was titled InfoCom. They're the company that made text adventures like Zork and the Hitchhiker's Guide to the Galaxy among others.
At noon on the 17th Evan K and I did a talk in front of about 500 people. The subject was the influence of the Mid-Atlantic region on the development of computer technology. Evan really has a gift for telling stories, he makes it look easy. We got a lot of goo">... [ read more ]
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AT&T 7300 / 3b1 with a DOS co-procby billdeg Total messages in this thread: 4 Updated: [ AT&T 3B1 Software ] 07/15/2010 Just got an AT& T 7300 / 3b1 with a DOS co-processor card. I have a new set of DOS-73 system diskettes AT&T UNIX PC Model 7300 ver 1.00, and a DOS-73 diagnostic. Matching manuals. Cleaned unit, does not power on. Fuse is OK.">... [ read more ] |
A New S-100 PIC-RTC Boardby monahan_z Total messages in this thread: 1 For people interested in building/repairing S-100 systems Andrew at N8VEM and I at 100Computers.com have just completed the construction and testing of an S-100 bus New Interrupt Controller and Real Time Clock Board. If you would like to read about this board please look here:- http://s100com...IC%20Board.htm There is a growing list of people getting interested in these S-100 systems. We get these bare boards produced in batches (typically $20-40, depending on demand). So if you would like to try this board you need to contact Andrew or I ASAP. It may be some time until the next batch. ">... [ read more ] |
Vector Graphic ZCBby billdeg Total messages in this thread: 3 Updated: [ ZCB replacement ] 07/10/2010 The Vector Graphic ZCB is a S-100 single board computer. Not working at the moment. Here is an outline of the work done. 1. Set up a Northstar Horizon with standard cards, working drive, working CP/M disk, verified boot works, etc. 2. replaced N* CPU card with the VG ZCB. It actually worked once, but only once. The ZCB is supposed to send a dot prompt to the terminal. When one enters B, it looks for the northstar drive controller, and boots the disk. 3. set up a breakout box to the RS232, learned that the system was not sending a detectable CTS or DSR. These are the signals sent by the N1489 driver chip. The voltage is 10V, should be 12V. 4. There are two 1K ohm resistors in R22, R23 that are only measured to be .9K, so something is reducing the resistance. When I pulled these two, they returned to 1K, so the resistors themselves are OK. 5. Replaced the 148">... [ read more ] |
Compaq DeskPro 386 25by Krensmeyer Total messages in this thread: 2 Updated: [ Compaq Deskpro 386/25 Video Card ] 07/10/2010 [thread moved] I am not a collector; but I am trying to preserve the one I own. It was my first real computer. I'm looking for someone who has a spare videocard for this machine or knows where I can find one... Thanks. Kirk">... [ read more ] |
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ATT 6300
This image was selected at random from the archive. Click image for more photos and files from this set.
Total messages in this thread: 1
Did you know that if you remove the little rubber feed there are screws that allow a person to access the supply electronics? Further, did you know that there is a fuse in the supply? It's a 1.25 inch 250V, 0.5A fuse. If you have a dead power supply, check the fuse...that might be the problem.">... [ read more ]