Re: Battlezone Signature Analysis Procedures

All the NOP does with the CPU is to make it single step through every
address starting at A0000 and going all the way to AFFFF and starting over
again...endlessly. A0000, A0001,A0002, A0003, A0004,...., AFFFE, AFFFF,
A0000, A0001,.... Thus the NOP for the 6502 is the same as the 6502A, the
6502A can just run faster...

John :-#)#

At 02:21 PM 24/07/2002 -0500, tom mcclintock wrote:

> From the SA guides that were up on Spies (SA notes page 47), I was under
>the impression the 6502A and the 8080 would provide the same signatures
>in 'test' mode, and the 6502 would provide different signatures. Part of
>the reason I haven't sat down with Peter's guides yet :)
>
>
>tm
>
>John Robertson wrote:
> >
> > The NOP is the same for 6502 or 6502A...I hardwired a 6502A in the NOP
> > state (and have a simple reset circuit hardwired to it as well) that I just
> > plug into a CPU socket.
> >
> > John :-#)#
> >
> > At 01:38 PM 24/07/2002 -0500, tom mcclintock wrote:
> >
> > >Peter Fyfe *did* do a signature analysis guide for Battlezone, but I
> > >don't know if he ever finished it. I've got a copy if anyone wants it. I
> > >am, however, not clear if he made his signatures with a 6502 or 6502A
> > >NOP.
> > >
> > >Peter, you still on here?
> > >
> > >
> > >tm
> > >
> > >Matt Rossiter wrote:
> > > >
> > > > Does anyone have documented procedures for Battlezone using either the
> > > > Cat Box or the HP 5004a?
> > > > If not, I suppose I could try getting started on one. I really like
> > > > Peter Fyfe's procedures for Asteroids.
> > > > The Battlezone schematics have procedures for the aux board but not the
> > > > main board.
> > > >
> > > > Matt
> > > >
> > > >
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Received on Wed Jul 24 13:39:00 2002