OK I'm going to throw this thing out the window in a moment

I downloaded a sample code from this forum written by Bruce

Code:
ASM
 __CONFIG _INTRC_OSC_NOCLKOUT & _WDT_ON & _PWRTE_ON & _MCLRE_OFF 
endasm

DEFINE ADC_BITS 10
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 50
number VAR word

'CMCON = 7 ' Comparators off
ANSEL = %00000001 ' GPIO.0 A/D in, rest digital
ADCON0.7 = 1 ' Right justify for 10-bit
GPIO = %00000000 ' Initialize outputs
TRISIO = %00000001 ' GPIO.0 = input, rest outputs
Tx              var GPIO.5


main:
adcin 0,number ' Read AN0
Serout2 Tx,84, ["val: ",#number,10]
pause 5000
goto main

With the 10K pot wired between the supply with the wiper to GPIO.0 and get readings between 437 and 440 !!!!!!!!!!!!!! - still just three digits between min and max.
I had to rem out the CMCON line - presumably the 12F683 has no comparators, would that be the case.