Fahrenheit: No Key Hack

[bgvanbur]

When I got a copy of Fahrenheit I wanted to get rid of the annoying key disc security. Well after doing a disassembly of the code, I was able to figure out a one bit modification to disable the key disc feature.

Instructions:

• Get an ISO or a BIN/CUE file of either Fahrenheit disc
• Modify byte 0x786 from 0x01 to 0x00 (it is the same location for both ISO and BIN/CUE)

This modification for disc 2 allows the disc to played without requiring disc 1 (so you can play the 32x version with just one disc). This modification for disc 1 allows the disc to be played without requiring a switch to disc 2 (so you can play the plain version even with a 32x installed).

Here is the partial disassembly of the code (IP, SP, and MAINCODE all assemble byte perfect with asmx):
http://dl.dropbox.com/u/26821164/FAHDIS.ZIP

I even made DVD cases by adding the words "NO KEY" to the DVD cover art availble from thecoverproject.net:

[Sparksterz]

This sounds awesome but alas I have not yet played this game...What was the security of the game not allowing you to do previously?

[Lastcallhall]

This sounds awesome but alas I have not yet played this game...What was the security of the game not allowing you to do previously?

I'm pretty sure this is it:

This modification for disc 2 allows the disc to played without requiring disc 1 (so you can play the 32x version with just one disc). This modification for disc 1 allows the disc to be played without requiring a switch to disc 2 (so you can play the plain version even with a 32x installed).

Essentially it separates the 32xCD and regular CD games into their own stand alone versions, instead of depending on one or the other to work properly. In the 32xCD case, it doesn't require the boot disc i.e. regular CD game to launch, and for the regular CD game, you could play that version even with a 32x attached (although I'm not sure why you would want to do this ).