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toinet
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Inscrit le: 15 Juin 2007
Messages: 2928
Localisation: Le Chesnay, France
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 Posté le: Mar 05 Jan 2016, 11:52 Sujet du message: Math Blaster! (Davidson, 1983) |
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This is one of the first Davidson titles on 3.5". The program runs under ProDOS. Probably v1.
When one copies the disk, the block #776 is in error. This is the usual Davidson protection: a check of a bad block. If you have an original, you will have an error reading the block. If you have no pb reading it, then you have a copy and the program crashes.
How to crack
Launch Block.Warden
Edit file STARTUP (if is not a BASIC file but a binary executable encapsulated into a BASIC file)
At file offset $1C6E: 90 0C -> A9 27
Save the block
The disk is at http://www.brutaldeluxe.fr/crack/
Reboot and... enjoy,
LoGo
1/2016
The entry point. At $2400, we have the protection check:
| Code: |
00/2491: 4C 94 24 JMP 2494
00/2494: 20 00 24 JSR 2400
00/2497: A0 FF LDY #FF
00/2499: 8C F4 03 STY 03F4
00/249C: A0 80 LDY #80
00/249E: 8C D6 00 STY 00D6
00/24A1: A0 FF LDY #FF
00/24A3: C4 FF CPY FF
00/24A5: F0 03 BEQ 24AA {+03}
00/24A7: 6C F2 03 JMP (03F2)
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The protection code at $2400
| Code: |
00/2400: 08 PHP Save all
00/2401: 48 PHA
00/2402: 98 TYA
00/2403: 48 PHA
00/2404: 8A TXA
00/2405: 48 PHA
00/2406: A5 F8 LDA F8
00/2408: 48 PHA
00/2409: A5 F9 LDA F9
00/240B: 48 PHA
00/240C: A5 FA LDA FA
00/240E: 48 PHA
00/240F: AD 30 BF LDA BF30 Get the drive
00/2412: 4A LSR
00/2413: 4A LSR
00/2414: 4A LSR
00/2415: 4A LSR
00/2416: 29 07 AND #07
00/2418: 09 C0 ORA #C0
00/241A: 85 F9 STA F9
00/241C: A9 00 LDA #00
00/241E: 85 F8 STA F8
00/2420: A0 01 LDY #01
00/2422: B1 F8 LDA (F8),Y
00/2424: C9 20 CMP #20
00/2426: D0 22 BNE 244A {+22}
00/2428: A0 03 LDY #03
00/242A: B1 F8 LDA (F8),Y
00/242C: D0 1C BNE 244A {+1C}
00/242E: A0 05 LDY #05
00/2430: B1 F8 LDA (F8),Y
00/2432: C9 03 CMP #03
00/2434: D0 14 BNE 244A {+14}
00/2436: A0 FF LDY #FF
00/2438: B1 F8 LDA (F8),Y
00/243A: D0 0E BNE 244A {+0E}
00/243C: A9 10 LDA #10 Block for 5.25"
00/243E: 8D 04 22 STA 2204
00/2441: A9 01 LDA #01
00/2443: 8D 05 22 STA 2205
00/2446: D0 0C BNE 2454 {+0C}
00/2448: F0 0A BEQ 2454 {+0A}
00/244A: A9 08 LDA #08 Block for 3.5"
00/244C: 8D 04 22 STA 2204
00/244F: A9 03 LDA #03
00/2451: 8D 05 22 STA 2205
00/2454: AD 30 BF LDA BF30
00/2457: 8D 01 22 STA 2201
00/245A: A9 03 LDA #03
00/245C: 8D 00 22 STA 2200
00/245F: A9 00 LDA #00
00/2461: 8D 02 22 STA 2202
00/2464: A9 20 LDA #20
00/2466: 8D 03 22 STA 2203
00/2469: 20 00 BF JSR BF00 Read
00/246C: 80 80
00/246D: 00 22 2200
00/246F: 90 0C BCC 247D {+0C} Branches on a copy
00/2471: 85 FA STA FA Saves the error code
00/2473: C9 27 CMP #27 Is it I/O err?
00/2475: D0 06 BNE 247D {+06}
00/2477: A9 FF LDA #FF Yes, we're good!
00/2479: 85 FF STA FF
00/247B: D0 04 BNE 2481 {+04}
00/247D: A9 00 LDA #00 No, a copy!
00/247F: 85 FF STA FF
00/2481: 68 PLA
00/2482: 85 FA STA FA
00/2484: 68 PLA
00/2485: 85 F9 STA F9
00/2487: 68 PLA
00/2488: 85 F8 STA F8
00/248A: 68 PLA
00/248B: AA TAX
00/248C: 68 PLA
00/248D: A8 TAY
00/248E: 68 PLA
00/248F: 28 PLP
00/2490: 60 RTS
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