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toinet Site Admin
Inscrit le: 15 Juin 2007 Messages: 2949 Localisation: Le Chesnay, France
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Posté le: Dim 17 Déc 2017, 16:35 Sujet du message: Miner 2049er bis (Microlab, 1982) |
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#983 - The other crack of that wonderful arcade game.
Disk structure
It is a single-sided game. Only T0 is readable with Locksmith Fast Disk Backup.
It looks like a DOS 3.3 type diskette: 35 tracks and 16 sectors.
Protection type
After an analysis with the bit editor of Copy II Plus, the structure is the disk is:
- a change of the address field markers: D396F2 D3B2
- a change of the data field markers: 96D3E5 9600
A further analysis of T0 with DiskFixer shows that the nibble table is changed. The first value is normally 96 (at $BA29) but that is not the case here, the value is $D5.
- an uncalled nibble count on track 1.
How to copy
Follow the instructions:
Code: |
Launch Advanced demuffin 1.4
Press P to bypass boot
Insert Miner2049er in D1
Insert a blank disk in D2
Copy T0 only
Relaunch Advanced demuffin 1.4
Insert Miner2049er in D1
Press B to boot
Copy T1-T22
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How to normalize
Launch DiskFixer and perform the following changes:
Code: |
T0/S2/53: 96 -> D5
T0/S2/58: D3 -> AA
T0/S2/5D: E5 -> AD
T0/S2/9E: 96 -> DE
T0/S2/A3: FF -> AA
T0/S2/E7: 96 -> D5
T0/S2/F1: D3 -> AA
T0/S2/FC: E5 -> AD
T0/S3/35: 96 -> DE
T0/S3/55: 96 -> D5
T0/S3/5F: D3 -> AA
T0/S3/6A: E5 -> 96
T0/S3/91: D3 -> DE
T0/S3/9B: B2 -> AA
T0/S4/29: D5 -> 96
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Interesting note
On T1, there is a nibble count that is never called. It is an exercise left to the reader to analyze it and see how it could be activated. That protection scheme is on both versions.
The disk image is available at http://www.brutaldeluxe.fr/crack/
Reboot and... enjoy,
LoGo
12/2017 |
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