[Coco] Odd behavior

[Bill Gordon]

But would this same Coco3 still work perfectly in every other aspect?

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Gene Heskett
Sent: Tuesday, December 17, 2013 6:19 PM
To: coco at maltedmedia.com
Subject: Re: [Coco] Odd behavior

Looking back at what you said from Arts perspective, I am inclined to think
that the coco3 that doesn't work, may have a half blown address bus driver
in the cpu.  This is something I would confirm by dragging out my dual trace
scope and checking the logic swings available at the cart socket.  
I'd almost bet on one of them either not pulling down to less than .1 volts,
or up past at least 3 volts. preferably almost 4.

In other words, that coco3 may have been damaged by someone changing game
carts without shutting it off at least 5-10 seconds before grabbing the
cart.  A millisecond short between traces is all it would take.  Then, if
the cpu is damaged its possible to have Mark put a "protector" and a 6309 in
it all in one trip to MN.  Then you would have a super coco3 than when
running the 6309 built version of nitros9, is nearly twice as fast as the
NIB version.