I don't think you'll find PS/2 cards that fit on PCI-E slots (because PS/2 is old and deprecated, as PCI is), and if your comp is recent, it probably has PCI-E slots instead of PCI. You probably want a PS/2 port to have full nkey rollover, as I don't see any other reason why you'd want a PS/2 port. Are you sure you really need it*?