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toinet
Site Admin
Inscrit le: 15 Juin 2007
Messages: 3019
Localisation: Le Chesnay, France
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 Posté le: Mer 31 Juil 2019, 17:17 Sujet du message: Return of Herakles (Quality Software, 1983) |
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#1018 - A game by Stuart Smith, later published by Electronic Arts. Disk image by Dan Chisarick (thank you, Dan, you know why). WOZ image by 4am.
Disk structure
It looks like a protected 16-sec disk.
Protection type
A change of epilog markers in the header field
D5AA96/DEABEB
D5AAAD/DEAAEB
How to copy
Boot my copy disk
Launch Advanced Demuffin 1.4
Enter the monitor
B99B:AB
Press ctrl-Y
Copy the disk
Let's play the game
It reboots!
How to shunt the dormant protection check
Boot my copy disk
Launch Disk Fixer
T1A/SA/B8:9D -> BD
T1A/S9/01:00 01 00 01 00 01 00 01 00 01 00 01 00 01 00 01
The disk image is available at http://www.brutaldeluxe.fr/crack/
Reboot and... enjoy,
LoGo
7/2019 |
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toinet
Site Admin
Inscrit le: 15 Juin 2007
Messages: 3019
Localisation: Le Chesnay, France
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| Posté le: Mer 31 Juil 2019, 17:18 Sujet du message: |
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This is the nibble check code at $89F0 or T18/SA/F0
| Code: |
00F0:AD 4D BF LDA $BF4D ; init the slot*16
00F3:18 CLC
00F4:69 88 ADC #$88
00F6:8D 4A 8A STA $8A4A
00F9:8D A1 8A STA $8AA1
00FC:18 CLC
00FD:69 01 ADC #$01
00FF:8D 2E 8A STA $8A2E
0102:18 CLC
0103:69 03 ADC #$03
0105:8D 54 8A STA $8A54
0108:8D 63 8A STA $8A63
010B:8D 6B 8A STA $8A6B
010E:8D 74 8A STA $8A74
0111:8D 7D 8A STA $8A7D
0114:8D 84 8A STA $8A84
0117:8D 8E 8A STA $8A8E
011A:8D 94 8A STA $8A94
011D:18 CLC
011E:69 01 ADC #$01
0120:8D 8B 8A STA $8A8B
0123:A9 0F LDA #$0F ; nb of nibbles to grab
0125:8D AB 8A STA $8AAB
0128:A9 80 LDA #$80
012A:8D AD 8A STA $8AAD
012D:AD E9 C0 LDA $C0E9
0130:CE AC 8A DEC $8AAC ; our retry counters
0133:D0 FB BNE $0130
0135:CE AD 8A DEC $8AAD
0138:D0 F6 BNE $0130
013A:A9 40 LDA #$40 ; retry counters again
013C:8D AD 8A STA $8AAD
013F:CE AC 8A DEC $8AAC
0142:D0 0D BNE $0151
0144:CE AD 8A DEC $8AAD
0147:D0 08 BNE $0151
0149:AD E8 C0 LDA $C0E8 ; probably never called
014C:A0 C3 LDY #$C3
014E:4C 31 8C JMP $8C31
0151:A2 02 LDX #$02 ; read D5AA96
0153:AD EC C0 LDA $C0EC
0156:10 FB BPL $0153
0158:DD A8 8A CMP $8AA8,X
015B:D0 E2 BNE $013F
015D:CA DEX
015E:10 F3 BPL $0153
0160:A2 03 LDX #$03 ; skip 4
0162:AD EC C0 LDA $C0EC
0165:10 FB BPL $0162
0167:CA DEX
0168:10 F8 BPL $0162
016A:AD EC C0 LDA $C0EC ; read 4*4
016D:10 FB BPL $016A
016F:2A ROL
0170:8D AE 8A STA $8AAE
0173:AD EC C0 LDA $C0EC
0176:10 FB BPL $0173
0178:2D AE 8A AND $8AAE ; make it a byte
017B:A8 TAY ; becomes our index
017C:AD EC C0 LDA $C0EC ; skip
017F:10 FB BPL $017C
0181:EA NOP ; lose time
0182:EA NOP
0183:AD EC C0 LDA $C0EC ; skip
0186:10 FB BPL $0183
0188:EA NOP ; lose time
0189:EA NOP
018A:AD ED C0 LDA $C0ED ; latch me
018D:AD EC C0 LDA $C0EC ; skip
0190:10 FB BPL $018D
0192:EA NOP
0193:AD EC C0 LDA $C0EC ; we have our hidden nibble
0196:10 FB BPL $0193
0198:99 20 00 STA $0020,Y ; store the nibble in zero page
019B:CE AB 8A DEC $8AAB ; next nibble
019E:10 B1 BPL $0151
01A0:AD E8 C0 LDA $C0E8 ; exit
01A3:A0 C3 LDY #$C3
01A5:4C 31 8C JMP $8C31
01A8:96 AA D5 HEX 96AAD5 ; want D5 AA 96
01AA:A0 HEX A0
01AB:D3 HEX D3 ; counter
01AC:A0 HEX A0 ; retry counter
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Very interesting routine at $A988 at T1A/SA/88
That procedure checks the nibbles stored in the zero page
| Code: |
0088:A2 0F LDX #$0F ; check our nibbles
008A:A0 03 LDY #$03
008C:B5 20 LDA $20,X
008E:D9 CA A9 LDA $A9CA,Y
0091:F0 23 BEQ $00B6
0093:88 DEY
0094:10 F8 BPL $008E
0096:A0 03 LDY #$03
0098:D9 CE A9 LDA $A9CE,Y
009B:F0 15 BEQ $00B2
009D:88 DEY
009E:10 F8 BPL $0098
00A0:A0 03 LDY #$03
00A2:D9 D2 A9 LDA $A9D2,Y
00A5:F0 07 BEQ $00AE
00A7:88 DEY
00A8:10 F8 BPL $00A2
00AA:A9 03 LDA #$03 ; bad
00AC:D0 0A BNE $00B8
00AE:A9 02 LDA #$02 ; bad
00B0:D0 06 BNE $00B8
00B2:A9 01 LDA #$01 ; good
00B4:D0 02 BNE $00B8
00B6:A9 00 LDA #$00 ; good
00B8:9D 01 AA STA $AA01,X
00BB:CA DEX
00BC:10 CC BPL $008A
00BE:A9 00 LDA #$00 ; init the prot counter
00C0:85 E0 STA $E0
00C2:20 DA A9 JSR $A9DA ; check now
00C5:A0 8C LDY #$8C
00C7:4C 31 8C JMP $8C31
00CA:F5 EA D5 00 HEX F5EAD500
00CE:F2 E5 CA A5 HEX F2E5CAA5
00D2:AA AB F9 00 HEX AAABF900
00D6:55 55 A0 A0 HEX 5555A0A0 ; the indexes
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And now the routine that sets the $E0 flag based on the values at $AA01
| Code: |
00DA:A2 0F LDX #$0F ; check the values
00DC:AD D6 A9 LDA $A9D6
00DF:8D D8 A9 STA $A9D8
00E2:AD D7 A9 LDA $A9D7
00E5:8D D9 A9 STA $A9D9
00E8:4E D8 A9 LSR $A9D8
00EB:6E D9 A9 ROR $A9D9
00EE:B0 04 BCS $00F4
00F0:A9 00 LDA #$00
00F2:F0 02 BEQ $00F6
00F4:A9 01 LDA #$01
00F6:DD 01 AA CMP $AA01,X
00F9:D0 02 BNE $00FD
00FB:E6 E0 INC $E0 ; a match, we're good
00FD:CA DEX
00FE:10 E8 BPL $00E8
0100:60 RTS
0101: HEX A0A0A0A0B1A0A0A0
HEX A0A0A0A0A0A0A0A0
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toinet
Site Admin
Inscrit le: 15 Juin 2007
Messages: 3019
Localisation: Le Chesnay, France
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| Posté le: Mer 31 Juil 2019, 17:23 Sujet du message: |
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But how to get the real values?
| Code: |
From a copy of the normalized disk, with Disk Fixer
T18/S9/A0:AD E8 C0 -> 4C 59 FF
Reboot and start playing.
When the game crashes into the monitor, grab the values from the zero page:
$20..$2F: F5 E5 F5 E5 EA E5 EA F2 EA E5 F5 F2 EA F2 F5 E5
On a "normal" copy, you'll get:
$20..$2F: 00 28 00 18 14 17 AA AA D0 07 D0 07 00 00 00 00
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And how to get the verified values of table $AA01
| Code: |
From a copy of the normalized disk, with Disk Fixer
T1A/SA/C2:20 DA A9 -> 4C 59 FF
Reboot and start playing.
When the game crashes into the monitor, grab the values from $AA01:
$AA01: 00 01 00 01 00 01 00 01 00 01 00 01 00 01 00 01
On a "normal" copy, you'll get:
$AA01: 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
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Gotcha! |
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