KayPro II keyboard schematic? - test-drb@ccmp.vtda.org

15 Dec 2007

...

Subject: Re: KayPro II keyboard schematic?
   From: ard at p850ug1.demon.co.uk (Tony Duell)
   Date: Sat, 15 Dec 2007 23:09:21 +0000 (GMT)
     To: cctalk at classiccmp.org

  It has an 8048 uP if memory serves and the output
is TTL level serial 
 ASCII.  Making it put out parallel would be a major hackup including 
 reprogramming an 8748. 
Or alternatively converting that serial output to parallel using an 
external circuit. How hard that is depends on the format of the serial 
data. If it's an asynchonous signal, with start and stop bits, a 40 pin 
dumb UART chip should do it.

What was used inside the Kaypro to receive the keyboard data? 
Z80 DART, The keyboard is a simple TTL level serial (async)
protocal.  It's bidirectional for lighting leds if memory serves.

Allison

...

-tony 