Floppy Connector; Table 3-12. Floppy Connector Pin Assignments - Motorola CPV5000 Installation And Reference Manual

Floppy connector

One diskette drive can be attached to the CPV5000 via the 26-pin header (J20)
for on-board mounting. Alternatively, two diskette drives can be remotely
attached to the CPV5000 via the 34-pin header on the transition module. Note
that the floppy disk drive controller cable should be no more than three feet (91
cm) long.
The floppy disk drives may be any combination of 360 KB and 1.2 MB 5.25
inch drives or 720 KB, 1.44 MB, and 2.88 MB 3.5 inch drives. Both drives
should be jumper-configured as drive one.

Table 3-12. Floppy connector pin assignments

Pin Signal
Number Mnemonic
1 +5V
2 INDEX-
3 +5V
4 DSO-
5 +5V
6 DSKCHG-
7 NC
8 NC
9 NC
10 MTR0-
11 NC
12 DIR
13 NC
14 STEP-
15 GND
16 WDATA-
17 GND
18 WGATE-
19 GND
Signal Description
Drive power
Beginning of a track
Drive power
Drive select 0
Drive power
Notifies disk controller the drive door has opened
Not connected
Not connected
Not connected
Motor enable outputs
Not connected
Controls direction of FDD head during seek operations
Not connected
Supplies step pulses to move head during seek
operations
Ground
Writes serial data to disk drive
Ground
Enables head of disk drive to write to disk
Ground
Floppy connector
3-19
3