--------------Galaxy Math-------------- A 4am crack 2016-03-10 --------------------------------------- Name: Galaxy Math Genre: educational Year: 1982 Author: Paul Foster Publisher: Random House, Inc. Media: single-sided 5.25-inch floppy OS: DOS 3.3 Previous cracks: none Identical cracks: #467 Snoopy To The Rescue #441 Garfield Double Dares #188 Garfield, Eat Your Words ~ 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#254 181 FREE A 003 HELLO A 063 GALAXY II *T 002 STARTUP *T 002 STARTUP2 *B 002 NOISE *B 004 SHAPES *A 002 LOAD *A 002 LOAD2 *B 034 ALOGO A 058 OLDGAL A 072 GALAXY FRACT 1 A 005 WGP01 A 063 TEST01 B 003 RDWT.OBJ0 ]RUN HELLO ...works... [S6,D1=demuffin'd copy] ]PR#6 ...grinds then crashes... My demuffin'd copy can not read itself, because it's still looking for the non- standard epilogue bytes. This is so common, I wrote a tool to fix it for me automatically: "Post-Demuffin Patcher". (I am not good with names.) I included the binary on my work disk, but you can download the source code at https://archive.org/details/ PostDemuffinPatcher4am It does a lot more than just fix non- standard epilogue bytes, but it looks like that's the only thing this disk needs. But let's find out! ~ 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,$9B change DE to AA T00,S06,$AE change AA to DE T00,S06,$B3 change DE to AA Quod erat liberandum. --------------------------------------- A 4am crack No. 647 ------------------EOF------------------