---------------Centipede--------------- A 4am crack 2015-03-18 --------------------------------------- Name: Centipede Genre: arcade Year: 1983 Publisher: Atari Media: single-sided 5.25-inch floppy OS: DOS 3.3 Other versions: - various uncredited cracks - Asimov has an uncracked .nib image Identical cracks: Defender (no. 249) ~ 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) works Copy ][+ nibble editor modified addres and data epilogue bytes ("AA DE EB" for each) Disk Fixer ["O" -> "Input/Output Control"] set Address Epilogue to "AA DE EB" set Data Epilogue to "AA DE EB" 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) 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#254 428 FREE A 002 HELLO B 066 CENTIPEDE ]RUN HELLO ERROR #11 SYNTAX BREAK IN 10 ]LIST 10 HOME : CLEAR : PRINT "BNCENT IPEDE" Ah, OK. The DOS on the original disk redefines the DOS commands. It uses "BN" instead of "BRUN". ]BRUN CENTIPEDE ...works... There we go. [S6,D1=demuffin'd copy] ]PR#6 ...grinds... My copy can't read itself yet. I have a tool to fix that. ~ 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 T00,S03,$91 change AA to DE T00,S03,$9B change DE to AA T00,S03,$35 change AA to DE T00,S03,$3F change DE to AA T00,S06,$AE change AA to DE T00,S06,$B3 change DE to AA T00,S02,$9E change AA to DE T00,S02,$A3 change DE to AA (Just RWTS fixes. There doesn't appear to be any further protection.) Quod erat liberandum. --------------------------------------- A 4am crack No. 272 ------------------EOF------------------