IBM 4840-563 System Reference Manual page 50

MSR connector
Pin Signal
1 +5V
2 Serial Data Out (TTL)
3 Serial Data In (TTL)
4 Ground
5 KBD Enable (low enables kybd data to system)
6 Keyboard data
7 Keyboard clock
8 Ground
USB port connector (x 6)
Pin Connector
1 5V VBus
2 -Data
3 +Data
4 Ground
SurePOS 500 Model XX3 Technical Reference, v 1.3
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