John B C Walker wrote:
>

> Problem:
>
> When I try to simulate the 17C42 in MPLAB, the DDRB,PORTA,PORTB etc
> registers never seem to show any changes. I'm sure my code is fine:
>
>         movlb   0               ;select bank 0
>         clrf    ddrb,1          ;all outputs
>         clrf    portb,1         ;clear port_b
> ------------------------

Some changes were made in version 3.09.03 having to do with the 17C42
ports.  This particular problem had been previously reported and is now
fixed.

DJ.