begin by changing this
Code:
but1    var trisb.4
but2    var trisb.5
ledwork var trisa.0
led1    var trisa.1
led2    var trisa.2
led3    var trisa.3
rs      var trisa.5
to
Code:
but1    var PORTB.4
but2    var PORTB.5
ledwork var PORTB.0
led1    var PORTB.1
led2    var PORTB.2
led3    var PORTB.3
rs      var PORTB.5
Let's see what happen now. i didn't go deeper than this.. for now