Re: Ultima Apple Emulation

[Tom Greene <tom@cowgod.org>]

On Jan 19, 10:30 am, Andy McFadden <fad...@fadden.com> wrote:
> > As far as I know, no other emulator supports the .v2d format which is
> > a shame because it's an open standard.
>
> Where is this open standard published?  Google didn't turn up much, but
> perhaps I was searching for the wrong things.  I'm curious to see how
> different sync-byte widths are represented.  (I'd also like to see an
> uncracked "spiradisc" Frogger image boot.)
>

I was actually just looking at the .v2d format last night. I couldn't
find any documentation either, but from what I can tell by looking at
a few images I made, it is pretty much like .nib with variable-length
tracks and quater-track resolution.

The file starts with an 8-byte header, which is the 4-byte image
length (i.e., the file size - 8) and ASCII "D5NI" tag.

That is followed by two bytes indicating the number of tracks in the
image, then the track data. Each track has a 4-byte header containing
the track number (in quarter-tracks) and length. Unused tracks are
omitted.

Tom