[Coco] Determining OS-9 Floppy Type

[Bruce W. Calkins]

> I'm fairly sure that the 40 track DSDD descriptor will actually read and
> write 35 track disks.  At least I don't remember having to use dmode to
> read the old original  RS distribution disks. 
This is correct.

> If my recollection is correct, then all you need to do is make a boot
> disk with 40 track DS device descriptors, or use dmode after booting
> OS-9, then do a "free /d0".  You should be able to tell how the disk is
> formatted by the number of sectors reported as the capacity of the
> disk.  I think (without doing the math) that 35t, DS = 630 sectors, and
> 40t, DS = 720 sectors.  I usually use 3.5" floppies on the CoCo,
> formatted to 720k in (Nitr)OS-9, which end up being 1440 sectors.  Of
> course, you do need to alter the device descriptor for those.
That worked for me.

> JCE
Bruce W.