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Processor Tech SOL 20 Terminal Computer

by billdeg - 07/01/2009
Total messages in this thread: 5
Last Post: [ 9090909090 ] 02/14/2014
The Processor Technologies SOL-20 Computer
As with most projects, the first thing that needs to be done is check the 5V output to the motherboard. I assisted Dan Roganti test the power supply and we compared with another power supply to confirm the results. The SOL supply is OK, or at least it compares with a known-working supply. The voltage reading on the board however is not OK.
The DC Voltage is consistently below 5V, something is shorting out.
The next step is to remove all socketed chips to see if there are bad TTL chip causing the voltage problem. The SOLOS Personality ROM daughterboard.... [ read more ]

1971 Burroughs ILLIAC IV

by billdeg - 02/03/2014
Total messages in this thread: 1
Burroughs Illiac IV bacj-pane printed circuit board
Burroughs Illiac IV back-plane printed circuit board. The chip number 1718-6263 chips are dated from 1969 and are (I think) early TTL chips similar to 1488's. Click image for larger view.
Obverse / flat end of a Burroughs Illiac IV "TQ" module. Click for larger view.
Burroughs Illiac IV TQ module side
Side view of a Burroughs Illiac... [ read more ]

Televideo TS-816 Youtube Video

by billdeg - 01/28/2014
Total messages in this thread: 1
Televideo TS 816 - A mutli CPU Z80 system with 128K RAM, 20Mb 8 inch Winchester hard drive and built-in 192Kb/sec tape unit for backups. The operating system is MmmOst with CP/M 2.2 and is capable of 16 simultaneous user terminal sessions. This system would have been used in a small business. The TS-816 was from the high point of Televideo and was certainly "vintage early 80's business machine". The 816's were relatively less expensive than the 1970's style mini computers Televideo strove to replace. Eventually various forms of networked IBM PC/XT/AT type machines knocked systems like the TS-816, TRS-80 II/12/16 and Altos 8000 MP/M systems out of the market. http://youtu.be/zTVvMvvOgDE href="/televideo/ts-816/">New photos (sort by file date) Al K. sent me this http://bitsavers.t...enance_Manual_Jan83.pdf... [ read more ]

MITS Altair 680 16K RAM

by billdeg - 04/15/2013
Total messages in this thread: 3
Last Post: [ MITS 680 16K RAM installed ] 01/23/2014
MITS Altair 680 16K Static RAM card.
Close up of the MITS Altair 680 16K Static RAM card.
Front (before restoration) Rear (before restoration) So far I have de-soldered a bad socket. Most of the components will need to be replaced. More to come.... [ read more ]

1972 Casio-mini calculator

by billdeg - 01/17/2014
Total messages in this thread: 1
1972 CASIO-MINI calculator
The 1972 Casio-mini was the first handheld calculator. Over 2 million units were sold. This calculator helped launch the PC revolution - how? The inexpensive mini and other early handheld calculators forced other manufacturers, like MITS, out of the market (see MITS 1440)..looking for a new business MITS went on to produce the Altair 8800 computer and the rest was history. Click on image for larger view.
More Casio Mini pictures... [ read more ]

Xerox Alto RAM MM5280D boards

by billdeg - 01/09/2014
Total messages in this thread: 1
Xerox Alto MM5280D RAM chips 1976
Close up view of a Xerox Alto RAM board 16K dynamic MM5280D RAM chips, which have a silkscreen production date code of mid 1976. Click image for larger view.
Actual RAM boards are too large for my flat-bed scanner, so I took two scans of each RAM board imaged. I also have a third similar board, that's the source of the close up RAM chip view. Each board is 128K I believe, 16-bit. More photos.... [ read more ]

Intel 1974 P1103 Dynamic RAM Board

by billdeg - 01/09/2014
Total messages in this thread: 1
Intel branded RAM board populated with with P1103 dynamic RAM chips. Click image for larger view.
Not sure if the IA078 sticker on the board is the board ID or just a Q/A sticker. The board also has MOS Rev A printed on it. I believe "7410" printed on the board is the production date. More info needed. More photos... [ read more ]

Commodore VIC-20 Photos

by billdeg - 12/27/2013
Total messages in this thread: 1
Commodore VIC-20
The Commodore VIC-20 Computer. Click image for larger view.
VIC-20 Omega Race Cart
The VIC-20 Omega Race cart splash screen. Click image for larger view.
More photos... [ read more ]

Burroughs Boards - Experts out there?

by billdeg - 12/27/2013
Total messages in this thread: 1
I have a number of Burroughs boards that have the same bus/pin board as the board shown above. The chip dates are late 70's. Click image to see photos.
This one is interesting. Although not pictured, the label on the front of the toggle switch of this Burroughs card says Normal / I.P.H . Click image to see photos.
Not 100% sure this is a L5000 or some slightly never model. Click image to see photos.
I need to accurately iden... [ read more ]

Intel iSBC 80/10 Multibus System Board

by billdeg - 12/26/2013
Total messages in this thread: 1
Intel iSBC 80/10
Intel 8080 iSBC 80/10 CPU Board from around 1980. Click Image for larger view.
More photos M. Thompson says: The docs for that iSBC 80/10 board are in Bitsavers in: http://bitsavers.tr...dge.com/pdf/intel/iSBC/... [ read more ]

IBM Mainframe Tube Modules

by billdeg - 12/24/2013
Total messages in this thread: 1
Photo of the 4 tube units with tubes installed. From left to right: (?? no markings) / IN-306 / AM-308 / AM-3(?)23. Note that the unit with no markings has a cap kludged to the side. Click for larger view
Photo of the 10 tube units with NO tubes installed. From left to right: AM-320 / IN-501 / (no marking) / AM-3(?)23 / IN-501 / TR-307 / CF-311 / AM-306 / AM-312 / IN-307. Click for larger view
The subject of this thread will be the Ebay auction for the "Mark 1" tubes from 1951.... http://www.eba...DULE-/131073757653 ... Afte... [ read more ]

Mystery Items - Can You Help?

by billdeg - 12/24/2013
Total messages in this thread: 1
Can you ID the above or any of the cards here? ... [ read more ]

Burroughs L5000 Controller Card Photos

by billdeg - 12/23/2013
Total messages in this thread: 1
Burroughs L5000 MPA RAM board. The 1449 1112 RAM chips are Burroughs' part number for the intel 2102 RAM. Click image to see photos.
See also (used as reference, but unconfirmed) http://www...llery/bpgcomponents.htm... [ read more ]

The Elstart Amigo Computer Ad

by billdeg - 12/16/2013
Total messages in this thread: 1
Box from the Elstart Amigo computer system.
... [ read more ]

IBM PS/2 Model 25 8525

by billdeg - 11/07/2013
Total messages in this thread: 1
This is the first computer I bought with my own money, as a college student. At the time this was the perfect system for a school work...no more waiting in line in the computer lab for an IBM XT or MAC SE with the other students. The Model 8525 first appeared in the Spring 1987, just after the initial PS/2 launch.
Model 1391472 model M "space saver keyboard" had no number pad.
This system shipped with DOS 3.3. I purchased the optional Windows 1.04 "Collegiate Kit" that had early versions of Winwrite and winpaint programs. To print I used an IBM ProPrinter II. More photos... [ read more ]
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