> Wow! Anyone try to copy this yet? I'm not sure I understand how this
> works, but might it be possible?
>
> Actually, how is the encryption done on a regular cart? If we can pool
> all the known data, we might be able to get it to work. Personally, I
> don't know anything...but I'm willing to spend time on work arounds once
> I know how the scheme is set up.
Here's my understanding of 7800 carts. First of all 7800 cartridges are
NOT encrypted. However, they do contain what I would call a digital
signature. The idea is that the 7800 BIOS computes a digital signature
for the ROM before it transfers control to the ROM's code. Once the
digital signature is computed it's "compared" with the digital signature
embedded in the ROM. If the two do not "match" then the 7800 does not
execute the code in the ROM.
I'm sure it's more complicated than this, however, that's the basic idea.
Brad
--------------------------------------------------------------------------
Bradford W. Mott (bwmott@xxxxxxx) Computer Science Department
http://www4.ncsu.edu/~bwmott/www North Carolina State University
--------------------------------------------------------------------------
--
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/stella.html
Don't post pirate BINs to Stellalist. Be a programmer, not a pirate.
Write the best game, win framed autographs of famous Atari alumni!!
