An Amiga or WinUAE
(I’m using WinUAE)
Action Replay III or Rom Image.
Alternatively Beermon, Thrill Kill or Cartmon.
Pencil and paper
Blanks, if you use a real amiga.
Given that this game was cracked over
twenty years ago and the cracks/SPS originals are readily available on the
Internet, we are not doing a disservice to anyone by analyzing the code. This is for educational purposes only and
at your own risk and volition.
Make a copy of the disk using X-Copy to see
what we are facing.
Looks like a one track protection. Boot the copy and it just goes to a game
Read the bootblock
to see if it does anything special.
It’s a Rob Northen.
Disassemble to see that it doesn’t do much. Directory the disk.
Look at the startup-sequence to see what
Load phobia.prg into memory.
Search for 48 7a which is a PEA command and
start of the Rob Northen code.
This is the start of the Rob Northen. Given
that it’s not an encrypted bootblock version, it must
be the file version. This means that it will eventually return to unencrypted
code and scrolling down to find this point. This happens
The Rob Northen
key looks to be 7670CF6B due to the compare at 464BA. The standard way to modify this would be
to assemble a patch
This way whenever the check it called it
will return the correct values in D0 and 24.
Save the change back to disk and boot.
Loading picture loaded on the copy before.
The game loads and plays for both 1 and 2