Probably the best thing to do is find someone who has
an apple II and a copy of "Nibbles Away" or some
similar tool which can read the raw data.
Apple's 13- and 16-sector formats were based upon some
creative engineering. For example, while many drives
used an optical sensor to read the hole(s) marking
sector 0 (or each sector, on a "hard sector" disk),
apple did it in software, by spinning up the spindle
motor and waiting for a stable waveform to appear in
the read electronics.
Apple used a single-sided, 13- or 16-sector format
with 40 data tracks. The (Shugart?) drives were
capable of 80 tracks, at least in the stepper
electronics, but the first-generation heads could not
reliably write 80 tracks. (some interesting copy
protection and data-hiding techniques involved moving
the head servo through software)
There was a company that made a plug-in card for the
original IBM PC, allowing it to emulate an Apple II+.
I installed one of them for someone and (IIRC, this is
going back like 20 years) it had a piggyback
controller which allowed the PC to run apple software
and read apple disks. All I remember is cussing a lot
about the nightmarish tangle of ribbon cables.
I don't think the PC Bios would provide the right
hooks to read the data without modified controller
hardware, so best bet, find an apple II in someone's
attic. :-) Bonus points if there's a DOS 3.3 manual
around with the RWTS reference in it.
--- sety martin <wearing_a_greyhat@yahoo.com> wrote:
Hi all,
I would appreciate any help in trying to resolve a
problem I am having.
I am trying to recover data from some 5.25 inch
disks.
They came off an older Apple system. (Apple 2?).
I have tried using dd, Ghost, Encase, FTK, Winhex
and
Norton Utilites to view/image these diskettes
without
any success.
It is not clear to me if there is still valid data
on
these disks. My experience has shown me that data
on
a 5.25 inch can get corrupted over time. Does
anyone
know if the tools above could successfully read
these
disks? I am using a 1.2 Mb drive. If these tools
can't do the job, does anyone know of a definitive
way
to get at this data using an x86 or Sun system?
Thanks all,
Sety
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