IBM PS/2 80 Hardware Maintenance Reference page 17

IBM PS/2 Model 80 HMR
Keyboard Connector and Pointing-Device Connector
1.2.8 Keyboard Connector and Pointing-Device Connector
The two 6-pin connectors at the rear of the system board are for a
keyboard and a pointing device (mouse). The keyboard connector is marked
with a small keyboard figure molded into the back panel; the unmarked
connector is for the pointing device. The interface logic is the same for
both.
¦ Copyright IBM Corp. 1990
1.2.8 - 1