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toinet Site Admin
Inscrit le: 15 Juin 2007 Messages: 2928 Localisation: Le Chesnay, France
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Posté le: Mar 11 Avr 2017, 18:05 Sujet du message: La matematica con il computer v1 (Vifi Mondadori, 1983) |
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#915 - This is an Italian eduware to learn maths with the use of the BASIC language.
Protection type
This is an on-disk protection based on Apple's disk protection toolkit that was delivered/sold to some businesses to help them protect their software. That kind of protection was used in Ultima IV: the third header marker of the data field depends on the last character of a filename and all T/S pairs that belong to that file use the same third marker value.
Last but not least, when a protected sector is encountered, the next nibble read is put in the accumulator for the checksum instead of the usual #0 value.
How to copy
You will not get any disassembly of the original protection scheme as the method to copy the disk is:
1- format a DOS 3.3 slave disk (INIT HELLO)
2- boot the original disk, visited the monitor in my IIgs and saved memory (the $Bxxx area) in an upper bank
3- modify the read routine of the data field to call the protected one
What I did is:
- put the data read protected routine at $B600
Code: |
B600<B895.B8FFM
B61F:C9 AD F0 0F (to handle unprotected sectors)
B636:4C B902 (to return to the normal read routine)
B677:38 60 (because the exit with error address is there)
B8DE:4C B600
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- copy T3 to T22 with Advanced Demuffin 1.4
And that is all! You lose the original protected DOS 3.3 but in that case, the eduware still loads and runs fine, there is no check of the protected DOS 3.3.
The disk image is available at http://www.brutaldeluxe.fr/crack/
Reboot and... enjoy,
LoGo
4/2017 |
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