PS/2 interface

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The PS/2 interface is a serial keyboard and mouse interface developed by IBM for their PS/2 line of computers. It uses the same keyboard protocol as the AT keyboard interface, but uses a Mini-DIN 6 connector.

For desktop keyboards, the PS/2 interface has a number of advantages over the USB interface:

• PS/2 keyboards send commands directly to the host computer, unlike USB keyboards which must be polled for key-push events.

• Providing that the keyboard circuitry supports it, there is no limit to the number of keys which can be pushed and registered simultaneously over PS/2. The USB protocol is limited to 6 simultaneous key pushes.