[Techtoolslist] 6502 NOP, or Clock divider

[Martin White]

> 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 :-#)#