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Floppy Drive and Interface

Each signal is identified by its pin number on the cable used to connect the floppy drive to it's drive adapter. Note that there is a cable for the 3 1/2 drive and a different one for the 5 1/4 drive, yet the pin assignments are the same on both drives and cables.

Pin No. Signal Name
1 Ground
2 Density 1=Low/0=High
3 Ground
4 N/C
5 Ground
6 N/C
7 Ground
8 0=Index
9 Ground
10 0=Motor Enable Drive 0
11 Ground
12 0=Drive Select 1
13 Ground
14 0=Drive Select 0
15 Ground
16 0=Motor Enable Drive 1
17 Ground
18 0=Direction Select
19 Ground
20 0=Head Step
21 Ground
22 Write Data
23 Ground
24 0=Write Gate
25 Ground
26 0=Track 00
27 Ground
28 0=Write Protect
29 Ground
30 Read Data
31 Ground
32 0=Head Select
33 Ground
34 1=Disk Change/0=Ready
3 and 1/2" floppy5 and 1/4" floppy