Hey Neil

> Other than being bad form, are there any problems with using SFR's  
> such as ADRESH and ADRESL for some temporary RAM space
> (assuming the ADC is off)?

ISTR Microchip suggest using unaccessed SFRs as general purpose
RAM in the datasheet. 'bad form' can manifest itself in many ways if
you don't know what you're doing or don't pay attention ;-)

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