Mitsubishi Electric LS Pro Hardware Technical Reference page 78

Peripheral items
Interface
The drive has one connector. The pinout of the connector and an illustration are shown
below.
Connector
Pin
2
3
4
5
6
7
8
9
10
11
12
Note
All other pins are connected to 0 Volts.
Signal Density select 0,1
descriptions
Not currently used.
Drive select 0,1,2
The drive select inputs are used to enable and disable the other input/output lines.
When a select input is low the drive is active and the input/output lines are enabled.
When a select input is high, all outputs from the drive are disabled and all inputs are
ignored.
Index
When the drive is selected this line is pulsed low for each revolution of the disk drive
spindle.
Motor on
When this input is taken low and a disk is inserted in the drive, the drive motor starts.
When this input is taken high or a disk is removed the drive motor stops.
Direction
If this input is high the step input causes the read/write head to step away from the
centre of the disk. If this input is low the head steps toward the centre of the disk.
Step
A low pulse on this input will cause the read/write head to move to the next track. The
direction of movement is determined by the direction input at the end of the step pulse.
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Function Pin
density select 1 14
not connected 16
not connected 18
5V 20
density select 0 22
5V 24
index 26
5V 28
drive select 0 30
5V 32
drive select 1 34
Function
drive select 2
motor on
direction
step
2
write data
1
write enable
track 00
write protect
read data
head select
disk change
34
33