Re: Signature Analysis without a CAT box

A NOP is a NOP. Simply hardwire a 24 pin header to the required
configuration and install it in the boot ROM socket.

It seems for a Z80 that all you have to do is remove the boot ROM and as
long as the DATA lines are all pulled high then it will happily NOP...

John :-#)#

At 10:53 AM 02/07/2003 -0500, Tom McClintock wrote:

>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 12:58:19 2003