[Coco] HD floppy controller update: success!

[Chuck Youse]

On Sat, 2008-07-05 at 11:35 -0500, Joel Ewy wrote:
> Hey Chuck,  this is good stuff you're working on.
> 
> IMHO, I think a High Density CoCo OS-9 disk should be formatted the same
> as an MM/1 HD floppy.  The MM/1 uses the WD37C65, and 33 256-byte
> sectors per track.  I don't have any info immediately at hand about gap
> length.  In the MM/1 technical manual the "rates" parameter to dmode is
> $10.  Perhaps this is passed directly to the FDC, and the 37C65
> datasheet might give more specific info.

Hmm, that's a rather odd format.  Is that a 5.25" HD floppy or 3.5"?

The only problem I have with this is the fact that Linux freaks out when
you have a combination of 256-byte sectors and an odd number of sectors
per track.  And really that only concerns me because one of the main
advantages to having this controller is that it makes transport of files
between systems much simpler.

But really, it's not set in stone; it's all driver-driven at that point.
Even differing device descriptors under OS-9 should give you the
MM/1<->Coco enjoyment you want.

C.