IBM PC MMX Pentium HS-4500, Manual, Page: 30 / 51

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3.9 The Floppy Disk Drive Connector
A standard 34-pin header daisy-chain driver connector provides as CN19
with following pin assignment. Total two FDD drivers may connect.
z
CN19 : FDD CONNECTOR
PIN NO DESCRIPTION PIN NO DESCRIPTION
1 GROUND 2 REDUCE WRITE
3 GROUND 4 N/C
5 GROUND 6 N/C
7 GROUND 8 INDEX#
9 GROUND 10 MOTOR ENABLE A#
11 GROUND 12 DRIVE SELECT B#
13 GROUND 14 DRIVE SELECT A#
15 GROUND 16 MOTOR ENABLE B#
17 GROUND 18 DIRECTION#
19 GROUND 20 STEP#
21 GROUND 22 WRITE DATA#
23 GROUND 24 WRITE DATA#
25 GROUND 26 TRACK 0#
27 GROUND 28 WRITE PROTECT#
29 GROUND 30 READ DATA#
31 GROUND 32 SIDE 1 SELECT
33 GROUND 34 DISK CHANGE#
3.10 DC Main Power Connector
The HS-4500 provides a CN9 connector for the main DC power input
connection as following pin assignment of +5V and +12V.
z
CN9 : POWER CONNECTOR
PIN NO. DESCRIPTION
1 +12V
2 GROUND
3 GROUND
4 VCC
z
CN20 : POWER
PIN NO. DESCRIPTION
1 -12V
2 GND
3 -5V
4 GND