3.5" Floppy Disk Drive Connector Pinout

By Cèbe, . Permalink Retrocomputing

I may need to build a 34 (standard) <-> 26 (laptop) connector soon.

Source: IBM/PC pinout (common PCs)

Pin Name PC <-> Drive Description
2 /REDWC --> Density Select
4 n/c    Reserved
6 n/c   Reserved
8 /INDEX <-- Index
10 /MOTEA --> Motor Enable A
12 /DRVSB --> Drive Sel B
14 /DRVSA --> Drive Sel A
16 /MOTEB --> Motor Enable B
18 /DIR --> Direction
20 /STEP --> Step
22 /WDATE --> Write Data
24 /WGATE --> Floppy Write Enable
26 /TRK00 <-- Track 0
28 /WPT <-- Write Protect
30 /RDATA <-- Read Data
32 /SIDE1 --> Head Select
34 /DSKCHG <-- Disk Change/Ready

Source: 3.5 inch micro Floppy Disk Drive connector (26 pin) pinout

Pin Name PC <-> Drive Description
1 VCC --> VCC +5V
2 /INDEX --> Index
3 VCC --> VCC +5V
4 /DRVS --> Drive Sel
5 VCC --> VCC +5V
6 /DSKCHG --> Disk Change
7 n/c Reserved
8 READY --> used only in older drives. In newer drives N/C.
9 MEDIA --> used only in older drives. In newer drives N/C.
10 /MOTE --> Motor Enable
11 /REDWC --> Density Select
12 /DIR --> Direction
13 n/c Reserved
14 /STEP --> Step
15 GND Ground
16 /WDATE --> Write Data
17 GND Ground
18 /WGATE --> Write Gate
19 GND Ground
20 /TRK00 --> Track 0
21 GND Ground
22 /WPT --> Write Protect
23 GND Ground
24 /RDATA --> Read Data
25 GND Ground
26 /SIDE1 --> Side 1 Select

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