For those with machines that have a way to plug
into the KB matrix
and want PS/2 keyboard support, I would suggest a derivative of C=Key
(
www.jbrain.com/vicug/gallery/c=key/). It acts like an 8x12 keyboard
matrix to a vintage machine, no modifications to the machine are
needed. As currently laid out, it's designed to work with the CBM
VIC/64/128 series machines, but the source has been structured to
allow easy retargeting to any KB matrix up to 8x12. On the PS/2
side, it decodes all incoming data and can send data to the PS/2
keyboard, such as resetting the KB and setting indicator LEDs.
And, source code is under GPL, as is the design. I'm always up for a
donation if you like the work, but I was once a starving collector too.