Subject: Re: [stella] Meditations on the pause button|
From: "Edwin Blink" <edwin.blink@xxxxxxx>
Date: Mon, 6 Sep 2004 11:23:45 +0200
Glenn Saunders: wrote: > I would expect some difference between the NTSC and PAL version of the > 7800. The PAL version doesn't have the digital signature stuff. I found a 4K NTSC BIOS and 16K PAL BIOS at: http://www.geocities.com/messroms/index.html using a hex editor and Keith Henrickson 7800 bios disassembly. I found and verified the code that is copied to ram. The first 100 bytes are identical for both versions. so a signature check on (part of ) them is possible. Hmm, I just realized though that the test won't work when using a supercharger, cuttle cart or other cart that overwrites Ram before the test can be made.