RE: [stella] RIOT RAM test

Subject: RE: [stella] RIOT RAM test
From: "Dennis Debro" <ddebro@xxxxxxxxxxxxx>
Date: Sat, 30 Nov 2002 10:50:51 -0500
> > I don't think frying effects depend on RAM contents.
> > I've never dissassembled Space Invaders, but I've never
> > seen any classic game at all that doesn't completely
> > clear the zeropage on startup.
>     But couldn't the RAM zeroing occur after the VCS starts executing
> code?
>     I've zeroed the ram for that game, and many others, and was able
> reproduce the desired frying effect.

I always wondered if the frying effect had to do with how the ROM was
read. Could it be the amount of voltage going to the cartridge? I
wondered if this was what was causing Super Pacman to crash on the 5200
multi cart. Such as the ROM code is the same but depending on the
voltage sent in, the value read from the ROM could be different. It was
noticed that some PCBs would crash Super Pacman and others that have
different contacts wouldn't.

Of course this is a theory from a guy that doesn't understand the
hardware :) 

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