[Techtoolslist] Logic analysis and the Atari Test connector?

[Alex Yeckley]

One of the main reasons for my take on this is that I almost always needed to monitor a signal (such as the CPU clock) that wasn't brought out to the card edge.  I suppose if you add some sort of flying probe connection then the edge might be more useful.

You'll also need to reverse-engineer at least some portions of the code, if you haven't already.  I'm guessing you knew that.

-----Original Message-----
From: Techtoolslist <techtoolslist-bounces at flippers.com> On Behalf Of davids at oz.net
Sent: Wednesday, May 24, 2023 4:30 PM
To: 'Technical Tools Mail List' <techtoolslist at flippers.com>
Subject: Re: [Techtoolslist] Logic analysis and the Atari Test connector?

I have replaced all sockets on the board (rom, prom, and CPU). So that isn't a problem.

-----Original Message-----
From: Techtoolslist <techtoolslist-bounces at flippers.com> On Behalf Of Alex Yeckley
Sent: Wednesday, May 24, 2023 1:16 PM
To: Technical Tools Mail List <techtoolslist at flippers.com>
Subject: Re: [Techtoolslist] Logic analysis and the Atari Test connector?

I have used both approaches.  The "glomper clip" approach worked out better for me, but usually required replacing the original CPU socket first.  YMMV.

-----Original Message-----
From: Techtoolslist <techtoolslist-bounces at flippers.com> On Behalf Of davids at oz.net
Sent: Wednesday, May 24, 2023 3:59 PM
To: Technical Tools Mail List <techtoolslist at flippers.com>
Subject: [Techtoolslist] Logic analysis and the Atari Test connector?

I have a missile command board which using the fluke 9010 passes all memory and rom tests perfectly.  Also can exercise the pokey with no problem.

 

But when I try to go to UUT the game just starts to make an explosionish
sound and then watchdogs.   Game mode and test mode.

 

Verified the WD is working correctly.

 

So my next thought was to connect the 16702B to the CPU address and data lines and see if I could figure out where the startup goes off the rails.
Not supper excited about having to use the test clips on 16 bits of address,
8 bits of data and misc other signals.

 

Realizing there is that nice juicy edge connector right next to the CPU I was thinking about having an adapter board made that would have and edge card and then a set of pod connectors that I could just plug the pod cables into directly.

 

Am I reinventing the wheel here?  Anyone done this and have any gotchas to mention?

 

Or am I over thinking this and should just get a 40 pin glomper clip and attach to the top of the CPU? And connect to that?

 

David

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