> but I thought you had read back the A/D control registers and
> verified they were right.  At least this was a suggestion made
> very early on and I thought you had followed it.

You're absolutely right Olin. I'd forgotten that. The A/D registers
did indeed read back as I thought they should have been set. It's
what led me to conclude that the VCFG switches weren't working

Wow. That's a real mystery. How on earth do I explain it ?

> "Using an external RAM capture, after initialisation and a few 
> conversions -
>
> ADCON0 = 0x41 = b'01000001' => VCFG = 01 and ADON = 1" 

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