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toinet Site Admin
Inscrit le: 15 Juin 2007 Messages: 3020 Localisation: Le Chesnay, France
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Posté le: Mar 26 Déc 2017, 20:31 Sujet du message: Correct behavior The Mexican way (Baedeker's Travelware, 84) |
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#984 - This is a social studies eduware. Anyone who travels to a foreign country knows how easy it is to commit social blunders, as cultures and customs are different.
Disk structure
This is a nearly standard DOS 3.3 single-sided floppy disk. There are two floppy disks.
Protection type
The disk cannot be copied. A further analysis with the bit editor of Copy II plus shows a change of the epilog markers in the address and data fields:
- address field: D5AA96 FFFF instead of D5AA96 DEAA
- data field: D5AAAD FFFF instead of D5AAAD DEAA
There is also a jump to a widely used protection check at $BB00 that counts nibbles and compare results.
How to copy
Boot my copy disk and launch Advanced demuffin
Enter the monitor
Code: |
B930: 18 60
B98B: 18 60
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Press control-Y to return to the program
Copy the entire disks
How to normalize
Boot my copy disk and launch Disk Fixer
Perform the following changes
Code: |
T0/S2/3E:AB -> FF /* Standard sync marker
T0/S2/4B: AB -> FF /* ditto
T0/S2/9E: FF-> DE /* standard epilog markers...
T0/S2/A3: FF -> AA
T0/S2/A8: FF -> EB
T0/S3/35: FF-> DE
T0/S3/3F: FF -> AA
T0/S3/91: FF-> DE
T0/S3/9B: FF -> AA /* ...until here
T0/S4/69:A9 -> 60 /* Avoid rewriting markers
T0/S4/25:BD 8C C0 -> 4C 40 BB /* Skip some code
T0/S5/E4:54 -> CC /* End 2nd check with success
T0/S6/60:FE -> FF /* The standard sync marker
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Now, as the game does not run on an Apple IIgs, we must change the HELLO program.
Boot my copy disk and launch DOS 3.3
Perform the following changes
Code: |
LOAD HELLO
6 GOTO 55
56 GOTO 90
SAVE HELLO
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Perform the changes on both disks!
The disk image are available at http://www.brutaldeluxe.fr/crack/ and the full package on Asimov at /images/educational/
Reboot and... enjoy,
LoGo
12/2017 |
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