[Coco] Re: NitrOS9 on MESS?

[Roger Taylor]

At 08:44 PM 12/4/2003 -0500, you wrote:

> >> cc3disk.  The fact that the bug occurs when used with a VHD - thus
> >> bypassing cc3disk - confirms this observation.

Unless there is a duplicate set of problem code in either module for disks 
and vhds.


> >> bug, but what kind of timing bug would cause this bug.  As for
> >> "index hole signal code", can you elaborate on what that is?

I've always read that M.E.S.S. emulates the hardware as much as 
possible.  Perhaps it emulates the pulses generated by the passing of the 
index hole of a real floppy disk when a .dsk is mounted and 
accessed.  Anyway, I think someone reminded me that it is only used when 
formatting a floppy disk on a real CoCo controller.  Personally, I never 
had a need to know much about the index hole of a disk.



>I only know of one drive and driver that ignores the index pulse, and
>thats all 68k based amigas ever built, because they do read, and
>write, a whole track at a time with no regard to the index pulse.

Then how did it prevent from writing a track over the hole itself?  :)


>   It
>reads the whole track and a bit more into a buffer, and searches the
>buffer for the right "sector" address.