Re: Suggested change to add volume numbering to .dsk disk image files

["Thug" <mhurwood@dingoblue.nospam.net.au>]

"Joseph Oswald" <jaoswald@is06.fas.harvard.edu> wrote:
>
> > Plus, with DOS 3.3 and compatible formats, could the emulator not pick
up
> > the volume number from the VTOC? (Track $11, Sector $0, Byte $6. I don't
> > know if there's a similar record in ProDOS.) Protected disks or disks
with
> > their own custom DOS are still a problem, of course...
>
> I think that the volume number in the VTOC actually is *unrelated* to
> the volume number encoded in the sector address fields. I seem to recall,
> perhaps in the _DOSTalk Scrapbook_, some discussion which indicated
> that DOS 3.3 itself made no effort to properly initialize this value
> before formatting a disk.

Never heard of that before! It's certainly not mentioned in "Beneath Apple
DOS", which is where I get almost all my knowledge of DOS internals.

Just goes to show, even 20 years later I'm still learning stuff about the
Apple ][.


Michael