I tested Gi Joe and it looks messed up like in the first picture John. But
don't worry, thanks to an old post of Eckhard Stolberg
(http://www.biglist.com/lists/stella/archives/199705/msg00024.html) I was
able to perform some tests in order to have a better comprehension of the
motion registers operation. The problem is that I didn't implement the
motion registers exactly as in the original TIA, because it isn't a fully
synchronous design. I made some assumptions but now I am fixing the problem.
If you want to take a look at my simplified schematics of the motion
registers, you can download them from here:
http://www.mindspring.com/~2600onachip/simulation/motion_registers_schematic
s.pdf
I made a simulation in ModelSim that shows the mechanism that generates
Cosmic Ark stars. The plot of this simulation is in:
http://www.mindspring.com/~2600onachip/simulation/motion_registers_simulatio
n.pdf
Probably you all know how this works, but if anyone needs an explanation
please let me know.
Carlos Lopez
----- Original Message -----
From: "John Saeger" <john@xxxxxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Wednesday, August 28, 2002 5:30 AM
Subject: Re: [stella] 2600onachip: sorry about the question of Cosmic Ark
stars
> Maybe you could tell us what happens with GI Joe. This is related to the
> cosmic ark effect. Does your snake look like snake1.gif or snake2.gif?
>
> John
>
>
> Carlos Lopez wrote:
>
> > I'm sorry for not looking at the stella's archives first.
> > I have found some posts about this topic. It seems that it has to do
with
> > the horizontal motion circuit. I'm going to check what I did wrong.
>
>
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