[Coco] drive motors

[Gene Heskett]

On Sunday 14 July 2013 23:06:12 Glen VanDenBiggelaar did opine:

> Just out of curiosity, has anyone thought of using the boat load of
> available 720k Amiga 3.25 floppy drives available and setting the
> jumpers on them? Commodore just used off the shelf floppy drives and
> set the jumpers for them, the external ones are still dirt cheap and
> can be dissected for the drive. I have a closet full needing alignment
> and such, -just thinking outloud,
> 
Unfortunately, the huge majority of the miggy drives out there were 
destroyed by the miggy's and their penchant for tickling the drive back to 
track 0 every 2 or 3 seconds, the infamous click you heard as long as it 
was running unless you had downloaded and installed a 'no-click' patch.
That constant tickle wore out both the piece of music wire used for the 
head carriage nut, and the phospher bronze spring on the other side of the 
screw that furnished the spring to hold the music wire into the spiral 
groove on the screw.  Compounded by the grease used being the worst dust 
magnet ever, and turning into a very hard wax in about a year, I became 
very intimately familiar with the miggies floppy drive, 880 and 1720k back 
when we had about 6 of them at the tv station.

One of the things left out of the ones for the miggies was an index pulse 
phto-diode and the led that drove it, since the amiga used a full track 
read/write, that could run totally unsynchronized with the disks rotation, 
it needed no index pulse, and os9 cannot format a disk without it.

Cheers, Gene
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