Internal Diskdrive

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The connector on a floppy drive consists of 34 conductors. Both control and data use this same cable. Most cables have a twist that interchanges pins 10 through 16 at the end of the cable (on 1). Most floppy connectors have a “key” between pins & 6, and 3 & 5, to prevent the cable from being reversed. At the other end, the dual row connector that attaches to the controller card will usually have a set of ridges that coincide with cutouts in the controller card’s connector. Note that old style floppy-only controllers used a card-edge connector just like that of the drive.

Image:conn_idc34m.gif 34 PIN IDC MALE at the computer and diskdrives

Pin Name Dir Description
1 GND - Ground
2 /REDWC OUT Density Select
3 GND - Ground
4 n/c - Reserved
5 GND - Ground
6 n/c - Reserved
7 GND - Ground
8 /INDEX IN Index
9 GND - Ground
10 /MOTEA OUT Motor Enable A
11 GND - Ground
12 /DRVSB OUT Drive Sel B
13 GND - Ground
14 /DRVSA OUT Drive Sel A
15 GND - Ground
16 /MOTEB OUT Motor Enable B
17 RES - Reserved
18 /DIR OUT Direction
19 GND - Ground
20 /STEP OUT Step
21 GND - Ground
22 /WDATE OUT Write Data
23 GND - Ground
24 /WGATE OUT Floppy Write Enable
25 GND - Ground
26 /TRK00 IN Track 0
27 RES - Reserved
28 /WPT IN Write Protect
29 GND - Ground
30 /RDATA IN Read Data
31 GND - Ground
32 /SIDE1 OUT Head Select
33 GND - Ground
34 /DSKCHG OUT Disk Change

Notes

  • Direction is Computer relative Diskdrive
  • All odd pins are GND, Ground
  • Can be an Edge-connector on old PC’s

References

Category:Data Storage Connectors

 

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