IBM 6648 - Manual (Page 70)

Input/Output connectors
1
2
1 Mouse 8 Audio input connector
2 USB connector 2 9 Microphone connector
3 Parallel connector 10 Monitor connector
4 Serial connector 2 (joystick/MIDI connector in
some models)
11 Serial connector 1
5 Power connector 12 USB connector 1
6 Ethernet connector 13 Keyboard connector
7 Audio output connector
56
Hardware Maintenance Manual: IBM NetVista Computer Types 6058, 6059, 6269, 6568, 6569, 6578, 6579, 6648,
6649