What do i need to do to use P1 as output ports? Just writing to them doesn't seem to have any effect
If the chip is not bad, the following can be the cause:
1) code not running.
2) wrong SFR address (check generated machine code in assembler listing).
3) hardware holding the pins up or down (cut a trace to test).
4) bad code.
5) ignored assembler/compiler/linker errors or warnings.


Make the simplest possible program

loop: set p1
clear p1
goto loop

If it does not work, post it here

Erik