>>
    movlw B'00111111'
    movwf TRISA     ; Port A is all inputs
    movlw B'00000110'
    movwf ADCON1    ; Port A is all digital
    movlw B'00000000'
    movwf ADCON0    ; Turn off A/D
    tris PORTB      ; Port B is all outputs
    tris PORTC      ; Port C is all outputs

loop:
    movf PORTA,0    ; Grab data at port A
    movwf PORTB     ; Dump to port B
    goto loop

    end
<<

For one thing, you've totally ignored bank settings.  You do need to pay
attention to these.  Check out my DBANKIF and related macros if you want a
more automatic way of setting the banks.  You can find them in STD.INS.ASPIC
at http://www.embedinc.com/pic.

Secondly, don't use the TRIS instruction.  I'm surprised the assembler
didn't give you a warning.  This is an old instruction that is (has) being
obsoleted.  Note that it's not in the list of instructions on page 136 of
DS30292C.

It looks like you may have programmed some old chips a long time ago.  It's
time to sit down and read the manual again for the chip you are using now.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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