> The idea is this - a PS/2-keyboard to RS-232
converter - plug in
> any AT- style keyboard, hook the other end into the receive pin of the
> target's console port. I started from a) a microprocessor-based
The cheapest way to build that, if you don't mind the extra bulk, ...
Take one generic AT, plus keyboard, plus serial port.
Write code in a polled loop, or interrupt driven, to get keystrokes and
send them out the serial port. (there is some software already available
that includes that capability (such as PC-Talk)