RE: [stella] Are 7800 demos legal???

Subject: RE: [stella] Are 7800 demos legal???
From: Ruffin Bailey <rufbo@xxxxxxxxxxxxx>
Date: Wed, 24 Nov 1999 11:44:18 -0500
>Almost all other games
>have the encryption check run over the complete code and not just the
>top 4kb and they never jump out of that area, so their ROM images can't
>be used for homebrew games.

Okay, if you're willing to stomach a few more naive questions...

I assume Atari did the encrypting for game publishers, and that's why the
encryption check is "run over the complete code"?  How does the check work
that the check's run over only the first 4k in the homebrew scenario and
over 16k (or what have you) of another game?  Can you tell the encryption
check to just check out the first, say, 4 bytes of a game which includes a
jmp (that is, what part of the cart tells the check to stop after 4k in the
homebrew example)?

Sorry for the totally uniformed questions.


Ruffin Bailey

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