> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of David VanHorn
> Sent: Thursday, February 09, 2006 2:57 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] question from someone new to the list
> 
> I'm guessing heat or power has something to do with this.  Happens
more
> > in the summer that the winter (anecdotally) and we have many issues
with
> > the cheesy power in the casinos we have these in.
> 
> 
> 
> Everything about being in a casino is fun!
> I had some early educational experiences in Reno and Vegas concerning
> their
> carpeting, which I think is made by Wimshurst and VanDeGraff.
> 
> Running LAN cables under this carpeting was also pretty amusing, and
coin
> carts weigh a lot more than you'd think.

I came here to a Class II bingo based company after working in Vegas for
Class III companies.  Whole different worlds: Vegas versus Indian Class
II versus Indian Class II.

 
>   Well and it is H/W designed by programmers instead of real EE
> > types.  Everything is running
> > off the PC power supply instead of solid power supplies.
> 
> 
> :) Sounds like you need a crossover guy.. I happen to know one.

So is it easy for me to guess his name? <g>

> 
> Would heat and/or power issues affect the timing so it would fail
rarely
> > and inconsistently?
> 
> 
> Something to check: Oscillator fuse programming.
> If you have the wrong mode selected, you could be skipping clock
cycles in
> part of the chip.
> I posted something about this on the AVR platform recently involving
their
> CKOPT fuse.
> The default state sets the oscillator running at 0V to about 1/2VCC
and
> causes BIZARRE problems. Worse, it frequently seems to cause no
problems.

And what is this and how do I check it?

This that fuse word?

>From the contractor over a year ago I got
	On the programmer setting, set code protect on, wdt on, low
voltage
 	programming (if that is an option) off, brown out detect on,
power up
 	time enabled, XT (crystal).

Most of the chips come preprogrammed from him since he supplies us the
board that he designed.

> Skipping cycles internally could cause problems reading the EE, or
damn
> near
> anything else, but these problems typically will "cluster" around the
> internal peripheral with the least margin for clock amplitude.

Sounds like this is what I need to check then.



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