MVP3 Main Board
26
2-4-7 FDC Floppy Interface
Floppy interface connector
with 34 pins is used to attach the floppy drive
cable.
Pin
Signal
Pin
Signal
Pin 1
GND
2
Data rate selection
Pin 3
GND
4
NC
Pin 5
GND
6
NC
Pin 7
GND
8
FDC index
Pin 9
GND
10
FDD Motor A enable
Pin 11 GND
12
FDD Drive B enable
Pin 13 GND
14
FDD drive A enable
Pin 15 GND
16
FDD Motor enable
Pin 17 GND
18
FDC head direction
Pin 19 GND
20
FDC step pulse output to the drive during a SEEK operation
Pin 21 GND
22
FDC write enable serial data to the Drive
Pin 23 GND
24
FDC write enable identify
Pin 25 GND
26
Floppy disk track 0. Indicates that the head of the selected
drive is on track zero.
Pin 27 GND
28
FDD write protect. Indicates that the disk of the selected
drive is write-protected.
Pin 29 GND
30
Read disk data, serial data input input from the FDD
Pin 31 GND
32
Floppy disk side 1 select
Pin 33 GND
34
Floppy disk change. This is an input pin that senses whether
the drive door has been opened or a diskette has been
changed.
FDC: Floppy disk connector
1
2
33
34
