'Riddles & Stones'
Author:Lord Crass (guest: search)
Date: Sun, Mar 04th, 2012 @ 03:33 ( . )

This one checks protection on every level 10 and up. It moves the head back to track 1, then moves 2 half-tracks back into the drive stop. After this, it uses standard job queue to read in sector 18. The first 2 bytes are transferred to the c64 and used as a memory address for a table. Instead of getting the $39 $00 bytes it needs, it gets $01 $07, which is a valid t/s link in the sector which is part of the file "G4".

It's easily cracked, but I'm not entirely sure how this protection is supposed to work. Should there be a second sector 18 on that track that only gets read after the head bump, therefore getting different data?

Nibtools should be able to handle a duplicate sector on a track, shouldn't it?


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Replies:
--* Riddles & Stones
3/04/2012 @ 10:55--Pete Rittwage
3/04/2012 @ 12:26----Lord Crass
3/04/2012 @ 15:44------Pete Rittwage
3/04/2012 @ 15:51--------Pete Rittwage
9/04/2013 @ 18:17--tixiv
9/04/2013 @ 20:03----Pete Rittwage

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