On 2015-08-03 07:04 , Volker Kuhlmann wrote:
> RDY I think was used to power down the drive when not in use; the jumper
> disables that if the host doesn't control it.
> MD/MM, DC I'm not sure.

RDY indicated when a floppy was inserted and spinning, and was later
reused to indicate disk change. (Given this drive has a DC (disk change)
jumper the RDY and DC jumpers probably independently determine what is
put on pin 34. Only insert one of the two jumpers.)

I suspect
MD - spindle motor on drive select
MM - spindle motor controlled by motor on
(Likewise, only insert one of these two.)

Jim
Atari ST alumni

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