Keyboard Port; Auxiliary-Device (Pointing Device) Port - IBM 21Y Maintenance Manual

Table 8. Video-port connector pin-number assignments
Pin
13 Horizontal synchronization (Hsynch)
14 Vertical synchronization (Vsynch)
15 DDC SCL

Keyboard port

There is one keyboard port on the rear of the server.
Note: If you attach a standard (non-USB) keyboard to the
keyboard connector, the USB ports and devices will
be disabled during the power-on self-test (POST).
The following table shows the pin-number assignments for
the keyboard connector on the rear of the server.
Table 9. Keyboard connector pin-number assignments
Pin I/O
1 I/O
2 N/A
3 N/A
4 N/A
5 I/O
6 N/A

Auxiliary-device (pointing device) port

The system board has one auxiliary-device port that sup-
ports a mouse or other pointing device.
The following table shows the pin-number assignments for
the auxiliary-device connector on the rear of the server.
Table 10. Auxiliary-device connector pin-number
assignments
Pin
1 Data
2 Not connected
6
4
2
Data
Reserved
Ground
+5 V dc
Keyboard clock
Reserved
6
4
2
Signal
5
3
1
Signal
5
3
1
Signal
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