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Litton Sweda International 8452

by billdeg - 11/19/2010
Total messages in this thread: 1
A computer appeared on the floor of my shop the other day. It's a Litton Sweda International Floppy Disk Model 8452. I am not sure if this is a single 8" floppy disk drive or a computer with a floppy disk drive. On the back is a 15 pin female connector and two sets of four circular female 8-pin connectors. More to come.... [ read more ]

Tandon 100 1a/2a shugart 450 mpi 52

by billdeg - 11/13/2010
Total messages in this thread: 1
Today finally started working on the 30 full-height 5 1/4 drives that have accumulated over the past few years...... [ read more ]

Bryans Analog Plotter Model 20170/S

by billdeg - 11/08/2010
Total messages in this thread: 1
Bryans Analog Plotter Model 20170/S Bryans is an English company that made analog plotters. Click image for picture.
more photos... [ read more ]

Atari 520ST

by billdeg - 12/24/2009
Total messages in this thread: 4
Last Post: [ Atari 520ST SF354 Replacement ] 11/03/2010
The 1985 Atari 520ST Computer
This is a 16-bit Atari computer system with a 68000 processor. The 520ST was marketed to compete with the early Amiga computers and has similar capabilities and interface. The 520ST usually came with an SC1224 monitor and an SF354 disk drive. This particular system's SF354 disk drive is not working. More to follow. Pictures... [ read more ]

Toshiba T1000 laptop

by billdeg - 11/03/2010
Total messages in this thread: 1
The 1987 Toshiba T1000 laptop. This is not the first Toshiba laptop, the T1100 came first.
More Pictures... [ read more ]

Mark 8 Microcomputer Video

by billdeg - 10/14/2010
Total messages in this thread: 1
Mark 8 Microcomputer Jon Titus LCF Group Collection Floyd Virginia http://www.youtube.com/watch?v=RcgeWmh8ym8... [ read more ]

Ed Roberts (MITS / Atlair) dies at 68

by billdeg - 04/02/2010
Total messages in this thread: 3
Last Post: [ Remembering Ed Roberts / Biography ] 10/12/2010
PC World Article: http://www.p...s_at_68.html Popular Electronics Jan/Feb 1975 Articles http://vintagecomputer.n...-poptronics.cfm More information: http://e.../Ed_Roberts_(computers)... [ read more ]

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 ]
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