Re: Alternate Reality Crack

[sicklittlemonkey <nick.westgate@gmail.com>]

On Feb 24, 4:56 pm, "Charlie" <charlieD...@verEYEzon.net> wrote:
> On standard DOS 3.3 disks the volume number is in the VTOC (byte 06).  I've
> often wondered why emulators don't just look at this byte for .dsk images.
> Of course a copy protected image could spoof this number making it different
> than the ones in the sector header. Also, a non-standard DOS could move the
> VTOC making it difficult for the emulator to find.  Still I think it would
> be better for an emulator to use whatever it finds in the VTOC (track 17,
> sector 0, byte 06) than simply giving it a 254 or whatever.

Thanks, T17:S0:B6 = 0x97 = 151.

The vast majority of DSK images work with vol 254. Detecting DOS and
plucking the vol num out of VTOC might cause problems with some. In
any case converting to .2MG for the problematic ones is better than
using .NIB images.

Cheers,
Nick.