@BillT
2) Sounds like there's only 1 PS/2 port for EITHER keyboard OR mouse, not both
That's not a problem since you can use a splitter. My laptop just has one PS2 port but I can use simultaneously both keyboard&mouse.
edit: I mean external PS2 keyboard&mouse simultaneously, each one connected to the PS2 splitter, of course. AFAIK the splitter is just a cable without logic