-------------Alien Addition------------
A 4am crack                  2015-11-06
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Name: Alien Addition
Genre: educational
Year: 1982
Authors: Jerry Chaffin & Bill Maxwell
Publisher: Developmental Learning
  Materials (DLM)
Media: single-sided 5.25-inch floppy
OS: DOS 3.3
Previous cracks: none(*)
Identical cracks:
  #420 Fact or Opinion
  #419 Who What When Where
  #351 Home Row

(*) As far as I can tell, this version
    is different from all the other
    versions on Asimov. One of them has
    a completely different disk catalog
    and the other is DOS 3.2-based.
    Naturally they all have different
    protection schemes. Given that this
    version has a weaker protection, I
    would guess that it is an earlier
    edition, but the title screens are
    identical and the catalog has no
    dates.

                   ~

               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 "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?
  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
322 FREE

*A 002 HELLO
*B 006 AA-SHAPES
*B 009 AA-PLATFORM
*B 034 LOGO1
*B 034 LOGO2
*B 034 LOGO3
*B 018 LIB
*B 037 AA-GAME.OBJ

]RUN HELLO
...works...

[S6,D1=demuffin'd copy]

]PR#6
...grinds then crashes...

The demuffin'd disk can't read itself.
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
T00,S02,$9E change DA to DE

Quod erat liberandum.

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A 4am crack                     No. 491
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