Sony PCV-L400 - Manual (Page 57)

System Board 49
Keyboard/Mouse (KB/MOUSE) Connector
The combination keyboard/mouse connector is a 6-pin female PS/2-type
(mini-DIN) connector that can accommodate a PS/2 keyboard or mouse.
Keyboard/Mouse connector
Pin
Signal Name
1 Keyboard data
2 Mouse data
3 GND
4 +5V (fused)
5 Keyboard Clock
6 Mouse Clock
KY0032.VSD
1 6
KB/MOUSE