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Old 16th Apr 2019, 9:28 am   #1
Join Date: Mar 2015
Location: London, UK.
Posts: 31
Default Mystery Keyboard

I acquired this UK made vintage computer keyboard at one of the rallies last year. I was told by the seller that its provenance lies with the GPO.

Does anyone recognise this keyboard, if so do you know what computer equipment it was used with?

It has a 5-pin din which indicates it could be used with an original IBM PC. However being built in the 70s it predates the IBM PC, and the DIN plug pin-out is completely different.

The keyboard uses the General Instruments AY-5-2376 keyboard encoder IC. Requires +5V and -12V supplies, and outputs a serial ASCII like data stream. The PCB is marked CS20036/04, tested 8/2/79 by JM.

Any info, no matter how trivial would be much appreciated. Thanks.
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