[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! &nbsp;Now I can sell my cat box.

> >

> >

> >

> > -- Sent from my Palm Pre

> > On Jun 17, 2010 5:37 AM, Kevin Moore &lt;talon.k at gmail.com<lt%3Btalon.k at gmail.com>&gt;

> > 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 &lt;martin at guddler.co.uk<lt%3Bmartin at guddler.co.uk>&gt;

> > wrote:

> >

> >

> >

> > &gt;

> >

> > &gt; &gt; A NOP can easily be built by using a 6502 CPU and bending the

> > data lines

> >

> > &gt; up over the top, then hardwire them to NOP and disable any watchdog

> > reset,

> >

> > &gt; then plug the modified CPU into the board and power it up!

> >

> > &gt;

> >

> > &gt; That won't give catbox signatures on the 5004 though.

> >

> > &gt;

> >

> > &gt; It was me that posted about it I think. When I built mine I just used

> > the

> >

> > &gt; schematics for the catbox. I'm sure Andy Welburn built one as well and

> > I

> >

> > &gt; think he made his slightly differently? Maybe he wrote up some schems?

> >

> > &gt;

> >

> > &gt; &gt; I have a picture up on TTL FTP of several modified CPUs and an

> > Eprom

> >

> > &gt; (can't remember using that - might work), also a PDF of an article

> > written

> >

> > &gt; back in the 70s about making your own...both of these are files

> > starting

> >

> > &gt; with "NOP".

> >

> > &gt; &gt;

> >

> > &gt; &gt; John :-#)#

> >

> > &gt;

> >

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> >

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> >

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> >

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> >

> > &gt;

> >

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> >

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