> Once the clock fuses are set can they be changed ( not the
> code protection one, just the oscillator ones )?

Yes.

> If you reprogram the fuses over and over do you get: the last
> setting, a tendency to or them together to all 1's, a
> tendency to or them together to all 0's?

Not sure what you mean, if you program them over and over, you get what
you put in them.

> If they get ored together can I still use the chip somehow
> perhaps with an external oscillator?

With the fuses set for example at HS, you can use a full oscillator on
just OSC1, or a crystal and caps on OSC1/OSC2.  Not sure if that's what
you were asking though.

> How will the configuration setting in the hex file interact
> with the configuration settings in the PICALL programmer?

It should load them from the hex file.  I use MPLab and B. Dobaj's
PICALLW software and it works great.  I don't have to set any of the
fuse options in the programmer.

> Can I expect the Scope to work if I use a 10x 10 meg shielded
> cable?  I assume the OSC2 pin is a better place to probe than OSC1.

I've had weird results with this.  On some crystals, I've scoped a wave
between OSC1 and Gnd.  On others, I've only been able to scope between
OSC1 and OSC2.  Quite odd.

> Also thought I would try setting up for an RC clock .  Worth a try?

If accuracy is not a concern, it's a good first try.

> Finally thought it might be easier to run as 4 MHz.  Worth a try?

Shouldn't matter, if the chip is rated for the speed you're using, get
it to work how you want it, not as a compromise! :)

> Perhaps I am forcing the chip into sleep mode?

Do you use the SLEEP instruction?

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