---------Charlie Brown's ABC's--------- A 4am crack 2015-02-15 --------------------------------------- Name: Charlie Brown's ABC's Genre: educational Year: 1984 Publisher: Random House, Inc. Media: double-sided 5.25-inch floppy Other cracks: none (preserved here for the first time) Identical cracks: Garfield, Eat Your Words (4am crack no. 188) ~ Chapter 0 In Which Various Automated Tools Fail In Interesting Ways COPYA immediate disk read error Locksmith Fast Disk Backup unable to read any track EDD 4 bit copy (no sync, no count) copy works Copy ][+ nibble editor all tracks use standard prologues (address: D5 AA 96, data: D5 AA AD) but modified address epilogue (AA DE EB instead of DE AA EB) Disk Fixer ["O" -> "Input/Output Control"] set Address Epilogue to "AA DE EB" Success! All tracks readable! T00 -> looks like a DOS 3.3 RWTS T11 -> DOS 3.3 disk catalog T01,S09 -> startup program is "HELLO" Why didn't COPYA work? modified epilogue bytes (every track) Why didn't Locksmith FDB work? modified epilogue bytes (every track) EDD worked. What does that tell us? probably just structural protection (modified epilogue), no nibble check Next steps: 1. capture RWTS with AUTOTRACE 2. convert disk to standard format with Advanced Demuffin 3. patch RWTS to read standard format ~ Chapter 1 In Which We Attempt To Use The Original Disk As A Weapon Against Itself [S6,D1=original disk] [S6,D2=blank disk] [S5,D1=my work disk] ]PR#5 CAPTURING BOOT0 ...reboots slot 6... ...reboots slot 5... SAVING BOOT0 CAPTURING BOOT1 ...reboots slot 6... ...reboots slot 5... SAVING BOOT1 SAVING RWTS ]BRUN ADVANCED DEMUFFIN 1.5 ["5" to switch to slot 5] ["R" to load a new RWTS module] --> At $B8, load "RWTS" from drive 1 ["6" to switch to slot 6] ["C" to convert disk] --v-- ADVANCED DEMUFFIN 1.5 (C) 1983, 2014 ORIGINAL BY THE STACK UPDATES BY 4AM =======PRESS ANY KEY TO CONTINUE======= TRK:................................... +.5: 0123456789ABCDEF0123456789ABCDEF012 SC0:................................... SC1:................................... SC2:................................... SC3:................................... SC4:................................... SC5:................................... SC6:................................... SC7:................................... SC8:................................... SC9:................................... SCA:................................... SCB:................................... SCC:................................... SCD:................................... SCE:................................... SCF:................................... ======================================= 16SC $00,$00-$22,$0F BY1.0 S6,D1->S6,D2 --^-- ]PR#5 ]CATALOG,S6,D2 C1983 DSR^C#254 041 FREE A 002 HELLO B 012 MSCDAT B 022 DCMPRS B 033 KCMPRS B 030 BCMPRS B 032 ACMPRS B 014 GAMMA B 025 CCMPRS B 033 LCMPRS B 030 MCMPRS B 031 GCMPRS B 029 fCMPRS B 023 ECMPRS B 033 FCMPRS B 034 HCMPRS B 023 ICMPRS B 026 JCMPRS B 002 REBOOT B 008 bCMPRS B 002 RB B 011 cCMPRS ]RUN HELLO ...works... [S6,D1=demuffin'd copy] ]PR#6 ...grinds then crashes... The demuffin'd disk can't read itself. This is not unusual. ~ Chapter 2 In Which We Remove All Traces Of Copy Protection Using An Automated Tool That I Wrote For Just Such An Occasion [S6,D1=demuffin'd copy] [S5,D1=my work disk] ]PR#5 ]BRUN PDP ; fix epilogue byte checking in RWTS T00,S03,$91 change AA to DE T00,S03,$9B change DE to AA T00,S06,$AE change AA to DE T00,S06,$B3 change DE to AA Quod erat liberandum. --------------------------------------- A 4am crack No. 226 ------------------EOF------------------