MIDI
Musical Instrument Digital Interface

5 pin DIN female connector (at the peripheral)
Pin | Name | Description |
1 | N/C | Not connected |
2 | GND | Ground |
3 | N/C | Not connected |
4 | CSINK | Current Sink |
5 | CSRC | Current Source |
Since the game port moved to sound cards, these connectors usually double as connectors for MIDI instruments; two of the redundant +5V and GND pins of the original standard were rededicated to MIDI input and output.