Re: [stella] Atari 7800

Subject: Re: [stella] Atari 7800
From: danboris@xxxxxxxxxxxxxxxx (Dan Boris)
Date: Tue, 17 Nov 1998 10:12:55 -0500
> Somebody mentioned that there is a byte in the last bank of the games that
> indicates where the code to run the encryption against resides.  I have
> been unable to determine where that byte is.  All I see is the code working
> on the cart between $ff00 and $ffff, where the key lies in the bytes from
> $ff80 and $fff8.  So I would have to assume that the only place this
> information could be is $fff8/$fff9 or $fffa/$fffb?

The page that cart starts on is stored in the upper nibble of $fff9. So if the cart starts at $C000, then $fff9  = $C7. The 7 in the lower nibble in mandatory. Also $fff8 has to set to $ff. 

Dan Boris

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