FDD Interface Connector Pin Assignments
Pin No.
Signal
1
Not connected
*1
3
Key
5
Ground
7
Ground
9
Ground
11
Ground
13
Ground
15
Ground
17
Ground
19
Ground
21
Ground
23
Ground
25
Ground
27
Ground
29
Ground
31
Ground
33
Ground
*1
Pin #3 of the FDD interface connector is physically removed because of the presence
of a keying plug on certain connectors (used to prevent incorrect connection).
*2
The drive selection is fixed to 1.
Power Connector Pin Assignments
(EI Connector)
4
3
2
1
2.5 mm (0.01 in.)
2
4
1
3
48.4 mm (1.91 in.)
Pin No.
Pin No.
Signal
1
+5 V
2
Ground
3
Ground
4
Not connected
32 34
31 32
Signal
2
Not connected
4
Not connected
6
Not connected
8
INDEX
10
Not connected
12
DRIVE SELECT 1
14
Not connected
16
MOTOR ON
18
DIRECTION
20
STEP
22
WRITE DATA
24
WRITE GATE
26
TRACK 00
28
WRITE PROTECT
30
READ DATA
32
HEAD 1 SELECT
34
DISK CHANGE
*2
GB
7