IBM 4840-544 Service Guide - Page 206
connectors, Keyboard, mouse, connector, Microphone
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Connector-pin assignments USB port connectors 12 34 August 3, 2006 Table 23. USB port connector-pin assignments Unpowered USB Pin Connector 1 5 V bus 2 −Data 3 +Data 4 Ground Note: Tablet USB ports are USB 1.1 compliant; side and back USB ports are USB 2.0 compliant. Table 24. USB port connector-pin assignments Powered USB Pin Shell Connector Shield 1 5 V Vbus 2 −Data 3 +Data 4 Ground 5 Ground 6 Vplus (12 V or 24 V) 7 Vplus (12 V or 24 V) 8 Ground Keyboard and mouse connector 1 2 3 4 5 6 Table 25. Keyboard and mouse connector-pin assignments Pin Signal I/O Pin Signal I/O 1 Keyboard data I/O 4 +5 V dc 2 Mouse data I/O 5 Keyboard clock I/O 3 Ground 6 Mouse clock Microphone connector The microphone connector is on the tower, at the lower left, below the side connector panel. 180