Hello I would like to contact David Knoll contributor of this page (http://old.pinouts.ru/Inputs/osborne_keyboard_pinout.shtml)
He wrote:
QuoteI'm intending to build a PS/2 keyboard adapter using an ATtiny and a bunch of 74LS374's, as my keyboard was busted when I got it (eBay bargain).
I have a non working Osborne 1 keyboard so he could help me.