Re: Ultima Apple Emulation

[BLuRry <brendan.robert@gmail.com>]

On Jan 25, 6:34 pm, sicklittlemonkey <Nick.Westg...@gmail.com> wrote:
> On Jan 26, 4:57 am, "Michael J. Mahon" <mjma...@aol.com> wrote:
>
> > Just for the record, the only analysis that can be guaranteed to
> > work is to faithfully (cycle-accurately) simulate the execution of
> > the disk *from boot* on an Apple II.  This is equivalent to a fully
> > automatic "boot trace" of the disk.
>
> An emulator can easily record which tracks are and aren't used during
> a complete play-through. And yes, I know - how can we be sure it was
> complete? ;-) Well, if tracks are discarded, and then the emulator
> alerts the user some day that the software is trying to access a track
> not present, it must be recovered from the original full disk capture.

And on that note, if you intercept RWTS you can tell what track/sector
is being read and where it is being stored in memory.  I've learned
some interesting things about some dos 3.3-based disks lately.... :-)

-B