Stickybear ABC IIgs (Weekly Reader Software, 1988)

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#947 - Fun for children 3 to 6. A fun way to reinforce letter and word recognition so necessary for good reading skills!

Disk structure
This is a GS/OS application running from a standard ProDOS 3.5" disk. But, as usual, there are bad blocks (#$55 and above). The protection checks the bad block. If there is none, we have a copy, otherwise we have an original disk.

How to copy
Use ZZCopy or Photonix II to copy your original disks (note that the second disk is a data disk and is not copy-protected). Then, store them in a dry and safe place. Thank you Alex for the disk images.

How to crack
Thanks to the Flaming Bird Disassembler, we search for the usual READ_BLOCK pattern in the ABC.SYS16 file and we find it in the second segment at address $18CD. The routine begins at $18B6 and is called at $030A. We will replace the JSR (20) with a BIT (2C)

Launch Block.Warden
Prefix /SB.ABC
Follow file ABC.SYS16
At offset $54F: 20 -> 2C

The disk images are available at http://www.brutaldeluxe.fr/crack/

Reboot and... enjoy,

LoGo
9/2017

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Some code