Re: Signature Analysis without a CAT box

Not having done so, has anyone made a 6502a NOP with anything other than
a Synertek 6502a CPU? I only ask because I have a few UMC 6502a CPUs and
because of tighter timing, those UMC CPUs will not work in Asteroids or
Asteroids Deluxe game boards.

tm

Matt Rossiter wrote:
>
> Yeah, you have to tie certain pins on the processor together. Instructions
> on how to build a NOP plug can be found here.
> http://www.gamearchive.com/Video_Games/Manufacturers/Atari/signatures/
>
> If you a have a signature analyzer, then the rest is just hooking up the
> STOP/START/CLOCK the right way and comparing documented signatures. With
> Atari vector games this is only helpful for fixing the program part of the
> game or the Math Box. Someone has yet to come up with a good step by step
> procedure for quickly troubleshooting the VSM.
>
> Matt
>
> ----- Original Message -----
> From: "Joe" <jb@joesarcade.com>
> To: <vectorlist@vectorlist.org>
> Sent: Tuesday, July 01, 2003 2:31 PM
> Subject: VECTOR: Signature Analysis without a CAT box
>
> > How should signature analysis be done without a CAT box? Take for
> > instance a Gravitar board... Do pins on the processor need to be tied
> > together?
> > Thanks,
> > JB
> >
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Received on Wed Jul 2 11:53:18 2003