Originally Posted by duga
Or a PS/2-port for external standard keyboards.
I already have this, done this years ago also. Its a hack/clone.
I use a USB mouse all the time, I also have a wireless mouse with four out of five buttons working. I did this this on a revision 2B motherboard where I can switch boards from USB back to the old 9 pin socket. Its the small PCB that can be detacted from the main motherboard (revision 2B only).