3.5" floppy drive question(s)

Christian Corti cc at informatik.uni-stuttgart.de
Thu Oct 16 03:41:25 CDT 2008

On Wed, 15 Oct 2008, Curtis H. Wilbar Jr. wrote:
> Steven Hirsch wrote:
>> That's not entirely correct.  Amiga 3000 and 4000 machines had a Chinon 
>> drive mechanism that could run at 1/2 speed in order to write hi-density 
>> formats with an FDC chip no capable of running at high data rates.

That's what I said.

> Is the interface on those drives compatable enough with non
> Amiga equipment such that if you had one, you could it on a
> 'double density' controller and do HD ?  Or did Amiga 'mangle'

Yes, it it a standard Shugart bus drive, jumpered with /RDY on pin 34 and 
/DC on pin 2.

> the interface too far from standard ?  Did the drive adjust speed
> on it's own (by detecting the HD hole) or did the Amiga have to
> tell it what speed to run ?

The drive does it on its own.


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