The Keyspan USB to PS/2 Keyboard/Mouse Adapter. $14.95 and twice as useful on a rainy day. One for the legacy tech files.
This adapter makes it easy to connect a PS/2 keyboard and PS/2 mouse to a USB port on your PC or Mac. It is compatible with all brands of PS/2 keyboards and mice. Windows: No driver software is required — just plug the PS/2 keyboard and mouse into the adapter, then plug the adapter into the USB port. The keyboard and mouse work within seconds.
Just note that this adapter will not work with simple KVM switches…