--- Tony Duell <ard_at_p850ug1.demon.co.uk> wrote:
> > some recognizable names (D0, D1, FG, H-HI...) and at least one with a
> > mysterous name (OP)...
> > AFAIK, pin 16 on a standard floppy is the MOTOR ON signal...
> Silly suggestion. Have you tried linking pin 16 on the drive to the drive
> select line (pin 14 most likely). Leave the drive select wire connected
> there as well. So that the motor goes on whenever the drive is selected.
I have not tried jumpering any pins together among other reasons because
on my Amiga schematics, pin 16 is driven by a discrete transistor rather
than directly off of a Gary pin (custom chip used in Amiga floppy controller).
> Alternatively, what about using whatever pin on the DB25 corresponds to pin
> 10. That's what becomes pin 16 after the IBM-twist, and thus is the
> motor-on signal for the second drive. That's probably the more likely
> setup, actually.
According to my records...
2 - chng
4 - inuse 1
6 - inuse 0
8 - index
10 - sel 0
12 - sel 1
14 - inuse 1 (yes, it's tied to pin 4 on the schematic)
16 - mtron
18 - dir
20 - step
etc...
Do I have this wrong?
-ethan
===
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Received on Mon Aug 23 1999 - 21:00:06 BST