Ribbon cable connects controller to one to four drives. Each drive has a 50 pin IDC edge connector.
Pin Name Dir Description
2 /REDWC <-- Reduced Write Current
4 n/c - Reserved
6 n/c - Reserved
8 n/c - Reserved
10 /FD2S <-- Disk is two sided
12 /DCG <-- Disk has been changed/door open
14 /SIDE --> Side select
16 /DLOCK --> Door lock
18 /HLD --> Head load
20 /INDEX <-- Index Pulse
22 /READY <-- Ready
24 n/c - Not connected
26 /SEL1 <-- Select Drive 1
28 /SEL2 <-- Select Drive 2
30 /SEL3 <-- Select Drive 3
32 /SEL4 <-- Select Drive 4
34 /DIR --> Direction
36 /STEP --> Step
38 /WDAT --> Write data
40 /WGAT --> Write gate
42 /TR00 <-- Track 00 (Zero)
44 /WPROT <-- Write protect
46 /RDATA <-- Read data
48 n/c - Not connected
50 n/c - Not connected
50 pin IDC male connector layout
50 pin IDC male connector
at the controller
50 pin IDC male connector layout
50 pin IDC male connector
at the drive
According to 1 reports in our database (0 positive and 1 negative) this pinout may be incorrect.

Is this pinout
Source(s) of this and additional information: Hardware Book, Dennis Painter
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