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2-4-7 Floppy Interface
Floppy interface connector with 34 pins is used to attach the floppy drive
cable.
Pin
Signal
Pin
Signal
Pin
1 GND
Pin
2
Data rate selection
Pin
3 GND
Pin
4
NC
Pin
5 GND
Pin
6
NC
Pin
7 GND
Pin
8
FDC index
Pin
9 GND
Pin
10 FDD Motor A enable
Pin
11 GND
Pin
12 FDD Drive B enable
Pin
13 GND
Pin
14 FDD drive A enable
Pin
15 GND
Pin
16 FDD Motor enable
Pin
17 GND
Pin
18 FDC head direction
Pin
19 GND
Pin
20 FDC step pulse output to the drive during a SEEK
operation
Pin
21 GND
Pin
22 FDC write enable serial data to the Drive
Pin
23 GND
Pin
24 FDC write enable identify
Pin
25 GND
Pin
26 Floppy disk track 0. Indicates that the head of the
selected drive is on track zero.
Pin
27 GND
Pin
28 FDD write protect. Indicates that the disk of the
selected drive is write-protected.
Pin
29 GND
Pin
30 Read disk data, serial data input from the FDD
Pin
31 GND
Pin
32 Floppy disk side 1 select
Pin
33 GND
Pin
34 Floppy disk change. This is an input pin that senses
whether the drive door has been opened or a diskette
has been changed.
Floppy
Pin 33
Pin 34
Pin 2
Pin 1
