> An example of working code would really help

Jason, as Bob said, the result is returned in 2 registers - ADRESL
and ADRESH (note that they are in different banks)

In this F88 example, the result is right-justified, ie the two highest bits
of the result, ADC <9:8>, will be <1:0> of ADRESH (bits <7:2> are
0) and the low 8 bits of the result, ADC <7:0>, will be in ADRESL. If
you left-justify, ADRESH will contain ADC <9:2>, ADRESL will contain
ADC <1:0> and bits <5:0> of ADRESL will be 0

         banksel adcon1
         mov     b'10000000',adcon1
;                  1                right-justified
;                   0               sysclk/2 disabled
;                    00             Vref+ = Vcc, Vref- = Vss
;                      xxxx

In the sampling routine, eg -

         bsf     adcon0,go_done
         btfsc   adcon0,go_done
         goto    $-1

         movff   adresh,res_h  ;copy result
         banksel adresl
         movfw   adresl
         banksel res_l
         movwf   res_l

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