-------------Geometry Alive------------ --------Fundamentals of Geometry------- A 4am crack 2015-09-23 --------------------------------------- Name: Geometry Alive! Fundamentals of Geometry Genre: educational Year: 1984 Authors: Jason A. Dylan, Activity Records, Inc. Publisher: Educational Activities, Inc. Media: single-sided 5.25-inch floppy OS: DOS 3.3 Previous cracks: none Identical cracks: #449 SAT Score Improvement System: Quantitative Comparisons ~ 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 data epilogue ("BF AA EB" instead of "DE AA EB") Disk Fixer ["O" -> "Input/Output Control"] set Data Epilogue to "BF AA EB" all tracks readable T00 -> looks like a DOS 3.3 RWTS T11 -> DOS 3.3 disk catalog T01,S09 -> startup program is "LOADER" 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? no half or quarter tracks almost certainly no nibble check (just structural changes to epilogue) 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#254 116 FREE T 008 STUDFIL A 003 LOADER *B 002 PRT.BIN *B 006 SHP.BIN *A 053 QUAD *A 005 LOGO *A 053 POLY *B 002 SOUND *A 052 BASICS *B 004 GEO.SH *A 027 MGMT A 006 EA MENU *B 004 PLOT.BIN *A 004 FILER *A 016 QUIZ2 *A 005 MOCK1 *A 057 ANGLES T 073 QUAD.TXT ]RUN LOADER ...works... [S6,D1=demuffin'd copy] ]PR#6 ...grinds... My copy can't read itself yet. 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 T00,S03,$35 change BF to DE T00,S02,$9E change BF to DE Quod erat liberandum. ~ Epilogue Entering a first name of "SCORES" will take you to an administrative screen to show student records. Entering a first name of "PURGE" will allow you to purge student records. There is no administrative password. I purged all student records on the disk using the "PURGE" function, but it turns out this does not zero out the entire text file, so personal student information is still visible with a sector editor. I overwrote all sectors of the file by hand. --------------------------------------- A 4am crack No. 461 ------------------EOF------------------