New Transducers TR-5001 - Manual (Page 43)

External Keyboard Connector
1 Pin # Signal Name
1 Keyboard clock
2 Keyboard data
3 PG
4 GND
5 +5V
PS/2 Keyboard & Mouse Connector
The following table describes the pin assignment of PS/2 Keyboard and
Mouse connector, which is mount on button of bracket. To attach PS/2
Keyboard and mouse, users need to connect trough a PS/2 1-to-2
Y-cable and plug into this Mini-Din connector. All the TR-979 SBC
boards come with a Y-cable. Contact your dealer if the Y-cable is
missing.
Pin # Signal Name
1 Keyboard data
2 Mouse data
3 GND
4 5V
5 Keyboard clock
6 Mouse clock
39 TR-5001 User Manual