HP xw4550 Service And Technical Reference Manual page 153

Floppy (diskette) drive
Internal serial
ENWW
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#
11 Ground
12 Unused
13 Ground
14 FLP_SEL_A#
15 Ground
16 Unused
17 Ground
Pin Signal
1 DTR2#
2 RXD2
3 CTS2#
4 DSR2#
5 TXD2
6 R12#
7 Ground
8 Ground
Connector pin descriptions 145
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
28 FLP_WP#
29 Ground
30 FLP_RD_D#
31 Ground
32 FLP_HD_SEL#
33 Ground
34 FLP_DSKCHG#
Pin Signal
9 +5V
10 +3.3V AUX
11 RTS2#
12 COMM_B_DET#
13 DCD2#
14 -12V
15 +12V