[Coco] Diskette Flipping Question

Steven Hirsch snhirsch at gmail.com
Thu Sep 13 11:08:32 EDT 2012

On Thu, 13 Sep 2012, Retro Canada wrote:

> I just got a 36-3029 drive unit using it with a FD-500 interface in my
> Coco3. It works nice, but I noticed that I cannot flip the disk to use
> the other side, since this drive is single sided. What is the problem
> ? Do I need to make another alignment hole on it ?
> The apple //c and C-64 don't have this problem I can flip and use both
> sides with no problem.

Apple 2 machines and C-64 use GCR encoding on floppies.  GCR is a 
self-clocking format that does not rely on the index pulse.  Indeed, I 
recall using hard-sectored diskettes on my Apple (10 index holes!) without 



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