[Techtoolslist] 6502 NOP, or Clock divider

[Pat Danis]

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> 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> 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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