Dear experts!
In an vintage computer restoration project I came accross a couple
of custom chips. They have been made in 1981 and 1982, probably in
the UK for a military application. The circuitry around them is
entirely made from mil spec TTL chips of the 54xx series. My question
would be which company is hidden behind the manufacturer code 90073?
More details on the chips and pictures of them can be found here:
(1) Part No. 214-017, Week 12/1981, picture at
http://www.baigar.de/TornadoComputerUnit/PECchips/214017_MFR90073.jpg
(2) Part No. 214-018, Week 44/1981, picture at
http://www.baigar.de/TornadoComputerUnit/PECchips/214018_MFR90073.jpg
(3) Part No. 214-020, Week 19/1982, picture at
http://www.baigar.de/TornadoComputerUnit/PECchips/214020_MFR90073.jpg
(4) Part No. 339-446, 67 PS 00205, Week 15/1981, picture at
For those interested: The chips where used in a vintage 12bit computer
probably from a radar application. I investigated this and partially
brought it back to life during the past 4 years and now I am curious
what
these chips are doing. Maybe the (1)-(3) are arrays of resistors?
Best regards,
Erik.
|
