------------Algebra Volume 1-----------
A 4am crack                  2015-07-17
---------------------------------------

Name: Algebra Volume 1
Version: 1.3 (1981-12-31)
Genre: educational
Year: 1981
Publisher: Edu-Ware, Inc.
Media: single-sided 5.25-inch floppy
OS: DOS 3.3
Other cracks: none
Identical cracks:
  Alligator Mix (crack no. 352)
  Home Row (crack no. 351)

                   ~

               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 address and data epilogues
  ("DA AA EB" instead of "DE AA EB")

Disk Fixer
  ["O" -> "Input/Output Control"]
    set Address Epilogue to "DA AA EB"
    set Data Epilogue to "DA AA EB"
  all tracks readable
  T00 -> looks like a DOS 3.3 RWTS
  T11 -> DOS 3.3 disk catalog
  T01,S09 -> startup program is
    "EDU-WARE"

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
...briefly displays a catalog, then
scrolls it out of view...

Catalog tricks are fun.

[Copy II Plus 8.4]
  [CATALOG]
    [SLOT 6, DRIVE 2]

                 --v--

CATALOG DISK            SLOT 6  DRIVE 2
DISK VOLUME 254


  *A 013 EDU-WARE
  *A 012 ALGEBRA MODULE 1
  *B 043 EWS.ROUTINES
   T 002 AM1.PROGRESS
   T 002 AM1.ERR
  *A 056 AM1.1
  *A 030 AM1.1.1
  *A 055 AM1.2
  *A 024 AM1.2.1
  *A 055 AM1.3
  *A 028 AM1.3.1
  *A 051 AM1.4
  *A 058 AM1.5
  *A 041 AM1.6
  *I 002 APPLESOFT
  *A 016 AM1.ERROR
   T 001 AM1.

SECTORS FREE:7    USED:553   TOTAL:560

PRESS [RETURN]

                 --^--

]PR#5
]RUN EDU-WARE,S6,D2
...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,$91 change DA to DE
T00,S03,$35 change DA to DE

Quod erat liberandum.

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A 4am crack                     No. 372
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