IBM 6648 - Manual (Page 151)

Input/Output connectors - Type 6269
1
1
2
1 Power cord 8 Microphone connector
2 Mouse connector 9 Audio input connector
3 USB connector 2 10 Audio output connector
4 USB connector 1 11 Monitor connector
5 Serial connector 2 12 Serial connector 1
6 Parallel connector 13 Keyboard connector
7 Joystick / MIDI
Chapter 3. Types 6058/6059/6269/6578/6579 137