28 Oct
2012
28 Oct
'12
3:17 p.m.
On 10/28/2012 1:10 PM, Fred Cisin wrote:
At one time, they permitted me access to a
"secret" page of instructions
on how to program it. Several parts of that page did not match what was
done in their supplied software (disassembly). I have since seen that
page show up in a few places on the web.
I didn't see this page at the time but
would have liked to.
If I recall didn't this board try to copy with a binary image approach?
I had a lot of protected media that played with the recording and if you
tried that the bit times got set all back to the same rate, and the
copies failed, even if copied by this board.
There was another program w/o hardware assist that would frequently beat
that method called copywrite (or such). I think the approach there was
to be sure that the total bits around each track was the same as the
original, which the copy2pc board didn't pay explicit attention to. I
think the assumption was if one did a binary copy of some sort that the
target would end up the same.
the place the copywrite board got screwed on was with a media (who made
it I forget) with a laser defect on a specific track. If the bits
defect time didn't match from the index hole to the defect, I know of
one software package that would fail. What it did was measure the bit
time up to the hole. Once it knew this they had allocated space after
the hole and attempted to write a sector from that bit position to the
end of the track. if that failed as it would with the special damaged
media at the correct spot, then they knew they had the correct failed
media, which was therefore genuine.
Unfortunately for the vendor if you copied the media, and used a write
protect on the media, you got the same result as their special media.
Quite a sport trying to create and defeat these schemes back then.
Jim