I've seen that and personally I'd like to
isolate the system from the
nasty scancode output from the keyboard so that the result looks like
simple ASCII 7bit. I'd have to reprogram the 8742s to do that as the
extracted parts only serve as a serial IO and buffer.
Although this is a cannon to kill a microbe, it can be done.
www.mcselec.com has a nice basic compiler with incluided PS2 keyboard
decoding. Write a small basic program to translate the scancodes to
whatever-you-want and you're in!