GIGAZINE2d
A Microsoft developer explains how an adapter that converts USB connectors that were once attached to mice and keyboards into PS/2 connectors works
A note on the USB-to-PS/2 mouse adapter that came with Microsoft mouse devices - The Old New Thing Basically, USB and PS/2 are completely different protocols and are not compatible. Therefore ...
Hackaday3y
EXPS/2 Keyboard Adapter Translates PS/2 And USB To MSX
If you now want to get one of these awesome pieces of computing history and would like to be able to talk to it, [danjovic] has you covered with the open-source EXPS/2 keyboard adapter.