HP Xw4550 - Workstation - 2 GB RAM Technical Reference Manual page 148

Internal USB system board 2x5 connector
The 2x5 internal USB system board connector can be mated to
either a wide 2x5 option cable connector or a narrow 1x5 option
CAUTION:
Always key all option connectors to the blank pin 9 position to
prevent damage to connectors and equipment. Always connect a
narrow 1x5 option cable connector to pins 1,3,5, and 7 only.
System fan (rear chassis), processor fan, and PCI fan (front
chassis) system board connectors
Floppy (diskette) drive
140 Appendix A Appendix A—Workstation connector pins
cable connector.
Possible equipment damage.
Pin Signal
1 +5V
2 +5V
3 USB6#
4 USB7#
5 USB6
6 USB7
7 GND
8 GND
9 (pin not keyed)
10 (not connected)
Pin Signal
1 Ground
2 +12V
3 Tach
4 CMD
Pin Signal
1 Ground
2 FLP_LOWDEN#
3 unused
4 FLP_WDO
5 unused
6 unused
7 Ground
8 FLP_INDEX#
9 Ground
10 FLP_MOTOR#
Pin Signal
18 FLP_DIR#
19 Ground
20 FLP_STEP#
21 Ground
22 FLP_WR_D#
23 Ground
24 FLP_WRTEN#
25 Ground
26 FLP_TRACK#
27 Ground
ENWW