[Techtoolslist] 6502 NOP, or Clock divider
Kevin Moore
talon.k at gmail.com
Thu Jun 17 12:43:36 EDT 2010
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 :-#)#
>
> >
>
> > _______________________________________________
>
> > Techtoolslist mailing list
>
> > Techtoolslist at flippers.com
>
> > http://seven.pairlist.net/mailman/listinfo/techtoolslist
>
> > FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment
>
> > Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
>
> >
>
> _______________________________________________
>
> Techtoolslist mailing list
>
> Techtoolslist at flippers.com
>
> http://seven.pairlist.net/mailman/listinfo/techtoolslist
>
> FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment
>
> Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
>
>
> _______________________________________________
> Techtoolslist mailing list
> Techtoolslist at flippers.com
> http://seven.pairlist.net/mailman/listinfo/techtoolslist
> FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment
> Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
>
More information about the Techtoolslist
mailing list