The PS/2 (Personal System/2) Port, also referred to as the mouse port or keyboard port, was developed by IBM. It is used to connect a computer mouse or keyboard to an IBM compatible computer. The PS/2 port is a mini DIN plug that contains six pins and is still sometimes found on all IBM compatible computers.
PS/2 Mouse Cable
| Pin | Voltage | Assignment |
|---|---|---|
| 1 | +2.0 to +5.5v | Keyboard Data |
| 2 | +4.8 to +5.5v | Reserved |
| 3 | Ground | Ground |
| 4 | +2.0 to +5.5v | +2.0 to +5.5v |
| 5 | +2.0 to +5.5v | Keyboard Clock |
| 6 | +2.0 to +5.5v | Reserved |