Reginald Neale wrote:

>  1. Make sure you have CONFIG set to XT osc.
Yep.

>  2. Put a 1 megohm resistor across the OSC pins and see if that
>     makes a difference.
I'll try that. Pardon my naivete, but for my own knowledge, why would
this make a difference?

>  3. You DO have the middle (GND) pin of the resonator connected,
>     right? It should go straight to the Vss pin of the device.
Yes, it punches directly into my ground plane right next to the resonator.

>  4. Look at your power supply filter cap size and its effect on
>     Vdd ramp up time.
The power is coming from a handheld computer, and is very clean and well
defined, so I don't think that's the trouble.

Again, 3 boards work fine in exactly the same conditions, so it must be
something on this particular board. This one was reworked a little more
than the others, so maybe an iffy solder joint or a stray bit of grunge?
Where should I look, on the OSC pins?

Dave Johnson