Obsolete Computer Museum User Comments RSS 2.0 Feed

Obsolete Computer Museum Main Page

Data Science XOR

Owner: Dave Coughlin
Location: unknown

One computer that I don't see in your collection is the XOR CP/M computer that I found in a basement. I have the manuals for it and the full schematics (wow) and this one is dated around 1982. I have it connected to an ADDS Regent 25 terminal with a null modem rs232 cable (9600 baud) . There is also a parallel port on the back and another serial port. This one has 2 8" floppy drives, and I bought the last box of 8" floppies I could find in town ! (I think the store owner was glad to see them go...) I believe these computers were sold as a kit and you could pick components that you wanted. I have included a bad picture of the guts.

Here is a little more on the specs right from the manual:

The XOR CPU was developed in 1977 and since then has undergone numerous design changes to take advantage of advancements in technology, and to conform to the IEEE 696 S-100 standards. A typical personal or business computer can be configured with only three boards and a mainframe power supply.


  • Z80A 4 Mhz processor
  • 2 serial RS232 I/O ports 8251
  • 3 8 bit parallel I/O ports 8255
  • On-board 2716 monitor PROM
  • M1 Wait state Generation
  • Memory management
  • Z80 DART/SIO
  • Board can now be used as a network slave or master.


  • WD 1795 Controller Chip set
  • Single Density IBM 3740
  • XOR Double density 8 in. (1.2 meg !!)
  • Concurrent 8in and 5in operation

3. XOR 64K Dynamic RAM:

  • Featuring 4116 250ns

This was taken from the XOR Data Science, Inc CPU Operation Manual. How about them specs !

I have also included a picture of my other junkers. Pictured are my Kaypro II, One of 5 (!) Apple III's with external floppy AND 5 megabyte hard disk (under monitor), a MAC 128K, a Commodore Plus 4 (complete with box and manuals) and a CompaQ Luggable. Next to the Compaq is a 40 meg HD from a Wang Mainframe (2200) made by Quantum (currently used as a doorstop)

P.S. A shameless plug: I am looking for an Apple LISA/XL for my almost complete MAC collection - If you ever come across one running or not, and don't want it, PLEASE email me !

Thanks, dcoughli@servtech.com

Most Recent Comments for the Data Science XOR:

No comments yet submitted

Click here to view all comments for the Data Science XOR and to leave your own.
Click here to view comments about other Data Science computers.

Send comments to here! (Note the new address. Lots of space to hold photos sent my way.)

Begone! Back to the Museum!