[Techtoolslist] 6502 NOP, or Clock divider
Stuart Banks
seafurious at hotmail.com
Thu Jun 17 13:18:42 EDT 2010
All Gottlieb System 80 / A / B pinball machines had the 6502 processor at the heart
of their CPU boards.
Stuart
> Date: Thu, 17 Jun 2010 11:43:36 -0500
> From: talon.k at gmail.com
> To: patdanis at verizon.net; techtoolslist at flippers.com
> Subject: Re: [Techtoolslist] 6502 NOP, or Clock divider
>
> Oh wait, which wire went where? I'll see about bread boarding up a couple,
> with some switches so you can go from Atari Sigs, to Standard NOP sigs.
> Although, what other games besides atari used 6502 processors? It just makes
> sense to have the clock divider because all the atari stuff have cat box
> sigs.
>
> Kevin
>
>
> On Thu, Jun 17, 2010 at 10:13 AM, Pat Danis <patdanis at verizon.net> wrote:
>
> > Awesome. Make me one please! Now I can sell my cat box.
> >
> >
> >
> > -- Sent from my Palm Pre
> > On Jun 17, 2010 5:37 AM, Kevin Moore <talon.k at gmail.com<lt%3Btalon.k at gmail.com>>
> > wrote:
> >
> > I just went ahead and built a clock divider out of 1 74s74 connecting the
> >
> > clock from a normal 6502 nop, into pin 3, then feeding not q pin 6 into d
> >
> > pin 2. and using q pin 5 as my new clock. It get's atari sigs now, and if I
> >
> > need to just use normal 5004a sigs, I can just pull the clock divider.
> >
> >
> >
> > Kevin
> >
> >
> >
> >
> >
> > On Thu, Jun 17, 2010 at 3:36 AM, Martin White <martin at guddler.co.uk<lt%3Bmartin at guddler.co.uk>>
> > wrote:
> >
> >
> >
> > >
> >
> > > > A NOP can easily be built by using a 6502 CPU and bending the
> > data lines
> >
> > > up over the top, then hardwire them to NOP and disable any watchdog
> > reset,
> >
> > > then plug the modified CPU into the board and power it up!
> >
> > >
> >
> > > That won't give catbox signatures on the 5004 though.
> >
> > >
> >
> > > It was me that posted about it I think. When I built mine I just used
> > the
> >
> > > schematics for the catbox. I'm sure Andy Welburn built one as well and
> > I
> >
> > > think he made his slightly differently? Maybe he wrote up some schems?
> >
> > >
> >
> > > > I have a picture up on TTL FTP of several modified CPUs and an
> > Eprom
> >
> > > (can't remember using that - might work), also a PDF of an article
> > written
> >
> > > back in the 70s about making your own...both of these are files
> > starting
> >
> > > with "NOP".
> >
> > > >
> >
> > > > John :-#)#
> >
> > >
> >
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> >
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> >
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