MSX Village forum

Diskdrive connector (34pin)
 
(Erik de Boer)
The scheme is the connector on the diskdrive, not the connector on the flatcable!
 
 
                          ___
  |---------------------|     |-------------------- |
   2  4  6  8 10 12 14 16 18 20 22 24 26 28 30 32 34
   1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33
  |-------------------------------------------------|
 
2  Dchange* 1  in use*
4  NC       3  gnd
6  DS3*     5  gnd
8  index    7  gnd
10 DS0      9  gnd
12 DS1      11 gnd
14 DS2*     13 gnd
16 M on     15 gnd
18 dirc     17 gnd
20 step     19 gnd
22 Wdata    21 gnd
24 Wgate    23 gnd
26 TR00     25 gnd
28 WP       27 gnd
30 Rdata    29 gnd
32 sidesel# 31 gnd
34 ready    33 gnd
Note: all signals have negative logic *) Normally not used 
#) Only for double sided drive

Connections and Pinouts
 
We start from the Pinout of the (male) socket on the back of the floppy drive:

[A Note about nomenclature: sockets appear on the back of drives, and on the motherboard; plugs (which fit into sockets) are to be found at the ends of (ribbon) cables; male/female refer to the pins (and, in the present context, the pins on sockets are always male, and those in plugs are always female).]
 
PIN 3 is absent on most drives (but not on my SPARC-5 drive, which was a SONY MP-F17W-2PF), and the corresponding hole on the plug is blocked so that you can't put it in the wrong way round. In addition there is often a key slot as shown in the socket, with a matching key on the plug, ostensibly for the same purpose.
 
All the odd-numbered pins (well, almost all) are connected to GROUND, and it is the even pins which do all the work. The actual Pinout is as follows: