[Coco] floppy controller update

[Bruce W. Calkins]

> The more I think about this, the more I think it must be an interleaving
> issue.  Consider that the sectors are most likely laid out in order by
> Linux's fdformat.  Consider that I appear to be getting something in the
> neighborhood of one sector every 200-250ms, and then consider that at
> 300RPMs, one revolution takes about 200ms.  Bingo.
> 
> Does that seem right?  Is anyone even listening to my jabbering
> anymore? ;)
> 
> C.

Some are listening, but don't know enough to add to the thread.

Please keep up the work and keeping us posted.

~BWC~