Sony PCV-R553DS - Manual (Page 71)

System Board 57
KEYBOARD and MOUSE Connectors
The KEYBOARD connector and the MOUSE connector are 6-pin female
PS/2-type (mini-DIN) connectors. They have identical pinouts.
KEYBOARD and MOUSE
Pin
Signal Name
1 DATA
2 NC
3 LOGIC GND
4 +5V (fused)
5 CLOCK
6 NC
KY0032.VSD
1 6
1 6
KEYBOARD
MOUSE