Andy McFadden wrote:
> In comp.sys.apple2 eric{at}neilsonhart.com wrote:
>> I believe a straight Nibble copy will get you pristine backups of
>> Ultima I-IV.
> 
> IIRC, Ultima I just used altered address / data fields, but Ultima II
> added some sort of secondary check (nibble count?) which .nib won't handle.
> 
>> 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.)

Right!

Adding support for quarter-track disks will only incrementally
increase the number of protected disks that can be represented.
Many protections lie outside the realm of quarter-tracked .nib
representation, even if the tracks are "synced".

It would be very helpful if a "census" of disks and the protections
they rely on were available, so that the cost/benefit ratio for
incremental additions of capability could be quantitatively assessed.

-michael

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