> Uses file register #(ASCII code for 'X') and W and does absolutely
> nothing with rcreg.
> Try
>         movlw 'X'
>         subwf rcreg,W
> Then test Z.

Unsettling how often the obvious is right under our nose

> I think you need to reread the explanation of subwf.
> You are subtracting W from a file register (or is it the other way
> around? i forget. doesn't matter here anyway).
>         movf rcreg,W
>         subwf 'X',w

SUBLW is the reversed mnemonic - subtract W from Literal

      movf  rcreg,w
      sublw 'A'
      btfsc   zero
      goto    conversionA
      movf   rcreg,w             ;W needs to be re-loaded
      sublw  'B'
      etc

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads