If you get bored and feel like taking a pic of the completed NOPs and u/l to your site, I am sure there are some more noobs than myself that would appreciate a pic for reference. Dave -----Original Message----- From: John Robertson <jrr@flippers.com> To: Technical Tools Mail List <techtoolslist@flippers.com> Sent: Sun, 25 Jan 2009 5:47 pm Subject: Re: [Techtoolslist] Atari 6502A NOP adapter electronicamuse@aol.com wrote:
Does anybody sell laid out PCBs for making NOPs?
I know that it's not tough to make them from scratch, but would nice to just have them already started.
thanks
Dave
I simply used good CPUs (6800, Z80, etc.) and bent the Data and Reset pins up over the top of the IC. Then I hooked the Data lines to correspond to the NOP instruction grounding or Vccing for '0' or '1'. Z80 you have to lift the Halt pin as well. Tie any essential pins ( for the CPU to run) to Vcc via 3K6 resistors. Reset can often be faked with a 10ufd and 10K resistor for the Reset pin. I was not aware of the 6502 NOP bit but using a 6502 with the Data lines tied in NOP worked for me! John :-#)#
-----Original Message-----
From: martin@guddler.co.uk <martin@guddler.co.uk>
To : Technical Tools Mail List <techtoolslist@flippers.com>be
Sent: Sun, 25 Jan 2009 12:32 pm
Subject: Re: [Techtoolslist] Atari 6502A NOP adapter
Thanks for the info Tim.
I've made a new NOP adapter today that just uses a pair of LS393s as a 16 bit counter as per the CAT box schematics and am now getting Atari signatures!
Martin.
On 25 Jan 2009, at 02:22, teeray wrote:
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