[Coco] Need new disk drive...

[Phill Harvey-Smith]

Gene Heskett wrote:
> On Wednesday 17 September 2008, Chuck Youse wrote:
>> On Wed, 2008-09-17 at 21:25 -0400, Gene Heskett wrote:
>>> That controller MAY have a Fujitsu 8877 FDC chip in it.  This chip is one
>>> of the few that can be used at 500 kilobaud data rates, allowing DSDD
>>> floppy drives to be used at 1440 kilobyte size.
>> Am I missing something?  Double-sided double-density 5.25" drives are
>> 360K, no?
>>
> If set for 40 tracks, double sided in the os9 descriptor then yes. 

<pedantic mode>
Or 80 track single sided.....as IIRC some early Atari ST machines used, 
at least here in the UK.
</pedantic>

>                                                                But I 
> believe that chip can have the high speed data rate hack applied, which means 
> the nearest $25 3.5" 1.44 meg drive with HD diskettes can be used in it.

But then wouldn't that be DSHD ? Double sided, High density ? Was this 
what was sometimes refered to as Quad density, or was that 80 tracks as 
opposed to 40 ?

Cheers,

Phill.