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PDP 11 Unibus Machine Controller

by billdeg - 10/07/2010
Total messages in this thread: 1
What we have here is a PDP-11 class Unibus machine controller. From the front panel it looks like this computer was used to splice "something". This is not the complete system. Click image for larger view.
Digital M series flip chips populate a backplane unit. Here is a close up view of the card labels. Click image for larger view.
I have the Digital book that describes the function of each flip chip in detail. There is no CPU logic, this unit was probably a custom analog... [ read more ]

IBM Thinkpad 500 model 2603

by billdeg - 10/07/2010
Total messages in this thread: 1
The IBM Thinkpad 500 model 2603 was an early netbook sized laptop from late 1993. This system boots up to Windows 95, but it originally came with Windows 3.1(1).
more pics ... [ read more ]

Go Corporation Penpoint Tablet

by billdeg - 10/07/2010
Total messages in this thread: 1
The 1991 GO Corporation Penpoint Tablet Model G400
This is a first generation stylus tablet computer. I don't have a power supply. More pics... [ read more ]

Magnavox Mystery Binary Counter

by billdeg - 01/11/2007
Total messages in this thread: 8
Last Post: [ Testing Homebrew Binary Counter ] 10/06/2010
Please help me identify the use of this unit ... when was it built? http://vintagecomputer.net/Magnavox/... [ read more ]

A new Z80 Board for the S-100 Bus

by monahan_z - 10/03/2010
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 Z80 Board. The board is capable of reaching up to10MHz in a system with an active terminated bus. It also can address up to 1M of address space with 16K windows  useful for CPM+. If you would like to read about this board please look here:- http://s100computers.com...0CPU%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 ]

Ohio Scientific Challenger 2P

by billdeg - 09/25/2010
Total messages in this thread: 4
Last Post: [ OSI 2P Update - RAM OK ] 10/02/2010
The 1977-1979 Ohio Scientific (OSI) Challenger 2P (C2-4P) is made up of two boards: OSI 500 (rev B) CPU and 540 I/O card. The keyboard controller model is 542. There is also a controller card backplane model 582. Click image for more pictures.
Initiated project, photos taken for closeup view of chips and board.
The OSI C2-4P upon power-on, before hitting the BREAK key to reset the system.<... [ read more ]

TRS 80 Model 1 Power Supplies - Repair

by billdeg - 09/28/2010
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 ]

Ohio Scientific Superboard II

by billdeg - 09/25/2010
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 ]

Vintage Computer Festival MW 2010

by billdeg - 09/20/2010
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/ href="/vcfmw-ECCC_2010/S... [ read more ]

CompuPro System Support 1

by billdeg - 03/26/2010
Total messages in this thread: 5
Last Post: [ 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 III

by billdeg - 09/09/2010
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 [ read more ]

VCF MW 2010 - The SIG

by billdeg - 09/06/2010
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 Photos

by billdeg - 08/29/2010
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.
[ read more ]

Microcomputer Manufacturers 1979

by billdeg - 08/21/2010
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 T3200SX

by billdeg - 08/19/2010
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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