I am having trouble with getting the external series crystal oscillator,
as shown in the PIC16C6X data sheets, running. I have had no trouble in
getting external parallel circuits going on other projects but this is
the first series circuit I have used. I need to use an external series
circuit because the crystal selection (5.0688 MHz) to get the UART
working at the required 9600 baud with no timing errors.

My problem is that I can only get the oscillator to run at 166KHz. The
only difference in the circuit is that I am using an ALS chip instead of
an AS and I have changed the resistor values to bias the inverters
properly.

Am I missing something really simple and stupid or can someone please
point me in the right direction.

Thanks

Peter G.