The PS/2-style port was once about as ubiquitous on PCs as USB connectors are today, and more than a few of us accumulated a fair collection of keyboards and mice that sported the 6-pin mini-DIN pl… ...

I also have a PS2 to USB adaptor for it so I have a wireless USB keyboard, so I'm fairly sure there's a standard protocol for these things.<BR><BR>There is of course this site (see under PC ...

It will allow you to connect either a PS/2 keyboard or a USB keyboard in fallback mode to the Expert using an ATMega328P and a bespoke DIN-13 to DB-13 cable.

He keeps a PS/2 keyboard handy to access the BIOS setup.<BR><BR>This was a hand-me-down motherboard that I onced used with a Belkin USB keyboard without any issue.