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5-12 Parallel Port, Floppy/Hard Disk Drive and SCSI
Connections
Note the following when connecting the floppy and hard disk drive cables:
• The floppy disk drive cable has seven twisted wires.
• A red mark on a wire typically designates the location of pin 1.
• A single floppy disk drive ribbon cable has 34 wires and two connectors
to provide for two floppy disk drives.
always connects to drive A, and the connector that does not have
twisted wires always connects to drive B.
Parallel Port Connector
The parallel port is located on J65.
See the table on the right for pin
definitions.
Floppy Connector
The floppy connector is located
on J12.
See the table below for
pin definitions.
Chapter 5: Advanced Motherboard Setup
The connector with twisted wires
Parallel (Printer) Port Pin Definitio ns
Pin Number
Function
1
Strobe-
3
Data Bit 0
5
Data Bit 1
7
Data Bit 2
9
Data Bit 3
11
Data Bit 4
13
Data Bit 5
15
Data Bit 6
17
Data Bit 7
19
21
23
25
Floppy Connector Pin Definitions (J12)
Pin Number
Function
1
GND
3
GND
5
Key
7
GND
9
GND
11
GND
13
GND
15
GND
17
GND
19
GND
21
GND
23
GND
25
GND
27
GND
29
GND
31
GND
33
GND
5-25
(J65)
Pin Number
Function
2
Auto Feed-
4
Error-
6
8
SLCT IN-
10
GND
12
GND
14
GND
16
GND
18
GND
ACK
20
GND
BUSY
22
GND
PE
24
GND
SLCT
26
Pin Number
Function
2
FDHDIN
4
Reserved
6
FDEDIN
8
Index-
10
Motor Enable
12
Drive Select B-
14
Drive Select A-
16
Motor Enable
18
DIR-
20
STEP-
22
Write Data-
24
Write Gate-
26
Track 00-
28
Write Protect-
30
Read Data-
32
Side 1 Select-
34
Diskette
Init-
NC
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