From AllPinouts
Connector pinout for: Psion Series 3a - 6 pin SIBO

Psion Series 3a - 6 Pin SIBO connector
| Pin
| Signal
|
| 1
| SIBO serial data
|
| 2
| SIBO data clock
|
| 3
| Siena=3DVin(6VDC) or 3c/3mx=3D5V out (30mA max)
|
| 4
| signal and power ground
|
| 5
| SIBO peripheral interrupt
|
| 6
| SIBO external switch on
|
References

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