Re: 6502 NOP, or Clock divider

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@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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Received on Thu Jun 17 06:37:42 2010