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TonyDuell · 6th Nov 2018, 5:27 pm

Do you know that it uses a normal PC/AT keyboard/signals (albeit on an odd connector)?

The PC/AT keyboard has 4 connections. +5V, Ground, Clock, Data.

Finding +5V and Ground should be easy enough. If you knew which other 2 pins were used, even if you didn't kno which way round you could try it both ways and see what worked (there is no chance of damaging anything). But I wouldn't want to connect the keyboard clock or data line to a random signal.

Perhaps start by finding all pins that go to ground and +5V. The reset switch and keyboard disable switch will have one side grounded. Maybe you'll be lucky and find just one cluster of 4 pins that contains a ground and +5V and 2 other signals. If so then I'd try connecting the keyboard there.

6th Nov 2018, 5:27 pm	#2
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: another 486 PC keyboard problem Do you know that it uses a normal PC/AT keyboard/signals (albeit on an odd connector)? The PC/AT keyboard has 4 connections. +5V, Ground, Clock, Data. Finding +5V and Ground should be easy enough. If you knew which other 2 pins were used, even if you didn't kno which way round you could try it both ways and see what worked (there is no chance of damaging anything). But I wouldn't want to connect the keyboard clock or data line to a random signal. Perhaps start by finding all pins that go to ground and +5V. The reset switch and keyboard disable switch will have one side grounded. Maybe you'll be lucky and find just one cluster of 4 pins that contains a ground and +5V and 2 other signals. If so then I'd try connecting the keyboard there.