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From: dmitton@mulberry.com (Douglas E. Mitton)
Newsgroups: comp.sys.apple2.programmer
Subject: re. LOGO Crack ...
Date: Mon, 12 Feb 1996 23:34:11 GMT
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The original post didn't make it to my UseNet server so I'm sorry if
I'm responding in the wrong group ... the post was about 'cracking'
LOGO, I'm assuming(?) 'Apple LOGO //' for 128K Apple //s.  The poster
wanted to be able to run the program on a 3.5" or hard drive instead
of the original 5.25".

I cracked this a few years ago and now have it running on 3.5's for
the kids on an Apple //c.  I did it manually and if you are
comfortable with Merlin, BINSCII, and some hacking, let me know and
I'll forward my notes/source to you!!!  I have not seen a procedure
for Copy // Plus to do this.

The following is part of my notes ... 

Apple Logo // Program Disk:

Problem:
The program disk is in ProDOS format but is copy protected so that
back-up cannot be made and the code cannot be moved to another storage
medium (ie. RAM disk).

History:
Any attempt to access the LOGO1 file on the original /LOGO disk
results in an I/O ERROR being generated by the ProDOS DISKII device
driver.  This is because volume track 1 (ProDOS blocks $8 to $F) are
stored in an altered format. All other files are accessible in the
normal manner.

The altering involves changing the block order on the disk AND
modifying the de-nibbling routine.

The original /LOGO/LOGO.SYSTEM is simply(?) a disk loader program that
loads the protected /LOGO/LOGO1 file to RAM at $2000 to $8FFF ($7000
bytes) and begins execution at $2000. It does this in a very sneaky
manner so that the loader cannot be interrupted manually or by load
failure and still leave the code image in RAM.

Un-Protected Apple Logo //:
This only has to be done once ...

- Copy ALL the files to another formatted disk (along with the newest
  ProDOS) EXCEPT Logo.System (redundant after the 'crack') and LOGO1
  (protected, can't copy it anyway).
- Next bload Logo.System into RAM.
- Bload my Capture.bin right behind it ($7000).
- Patch an error check vector and a relocate count byte.
  - To allow the Capture code to be accessed.
- enter the monitor and 2000G.
- The program loads LOGO1 from disk and saves it to /RAM/xx.
- Copy /RAM/xx to the newly created disk above as Logo.System.

You now have an un-protected Apple Logo // boot disk that can be
backed up freely or moved to another storage device.

The demo Logo programs on the original disk assumes a volume of /LOGO/
so some logo editing is in order.

The logical question will be answered by "it is probably illegal for
me to send you the modified 'Logo.System' file though its done all the
time in 'comp.apple2.emulators' (or whatever)".

If any one is interested I'll EMail a Binscii to you OR post it to
binaries ...

Sorry to have rambled on ...

----------------------------------
Doug Mitton
 * In Brockville, Ontario, Canada
   (City of the Thousand Islands!)
EMail: dmitton@mulberry.com
       d.mitton@genie.geis.com
---------------------------------