[Coco] Odd behavior

[Gene Heskett]

On Tuesday 17 December 2013 18:41:48 Bill Gordon did opine:

> But would this same Coco3 still work perfectly in every other aspect?
> 
Now you are putting me out on a persimmon limb.  Whatever is doing it, is 
probably going to take a scope to troubleshoot it.  Pulling and reseating 
the gime after polishing its edges with toothpaste, rinsing and drying 
might be an interesting experiment but absolutely should not be attempted 
unless you have a "plcc" puller because a cracked socket is worthless 
forever.

So at this point, the quickest way to get it fixed might be sending both 
off to Mark.  One last question?  Is the warranty seal still intact?  If 
so, and there are no other stickers on the bottom, there is a good chance 
its never had the coco3 kit put in it.  So we've about come full circle 
within the limits of remote control troubleshooting.

> -----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.
> 
> 
> --
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Cheers, Gene
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