> the compiler does not recognize the ansel register

That can happen if the project hasn't been configured with the correct
micro or includes, eg

          list P =3D 16F88
          include "P16f88.inc"

 __CONFIG  _CONFIG1, _CP_OFF & _HS_OSC & _MCLR_ON & _WDT_OFF & _PWRTE_OFF &
_BODEN_OFF & _LVP_OFF
 __CONFIG  _CONFIG2, _IESO_OFF & _FCMEN_OFF

For 16F88 project with no analogue, all outputs

         banksel trisb
         movlw   b'00000000'
         movwf   trisb

         banksel option_reg
         movlw   b'10000000'
;                  1           pullups off
         movwf   option_reg

         banksel ansel
         movlw   b'00000000'  ;all digital
         movwf   ansel

         banksel cmcon
         movlw   b'00000111'  ;comparators off
         movwf   cmcon

Joe

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