------SAT Score Improvement System-----
--------Quantitative Comparisons-------
A 4am crack                  2015-09-11
---------------------------------------

Name: SAT Score Improvement System:
  Quantitative Comparisons
Genre: educational
Year: 1984
Authors: Arrow Instructional Systems
Publisher: Hayden Software
Media: double-sided 5.25-inch floppy
OS: DOS 3.3
Previous cracks: none
Identical cracks:
  SAT Score Improvement System:
    Vocabulary (crack no. 374)

Both sides are bootable. I'll start
with side A.

                   ~

               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 "Q0"

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
SAVING IOB

]BRUN ADVANCED DEMUFFIN 1.5

["5" to switch to slot 5]

["R" to load a new RWTS module]
  --> At $38, load "RWTS" from drive 1

[press "I" to load a new IOB module]
  --> load "IOB" 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
052 FREE

 A 002 Q0
 A 028 START.REM4
*T 026 AA
 T 002 HAYDEN EXEC
 B 026 GRAPHICS
*T 018 AB
*T 028 DAA
*T 009 BAA
*T 038 BBB
*T 025 BCC
*T 039 CAA
*T 063 CBB
*T 022 CCC
*T 034 EBB
*T 023 DBB
*T 012 DCC
*T 033 EAA
*T 014 ECC
 B 002 ERR-RTN/SHAPETABLE

]RUN Q0
...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

Side B uses identical protection.

Quod erat liberandum.

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A 4am crack                     No. 449
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