Hi joseluistajada,

Now add a "pause 500" then make all of your port pins "LO"

All you have done in your simple little program is turn the pins ON.

Put a short delay after your last HIGH command then make all of the pins LO
and you should see your outputs flash on and off at a 1/2 second on and 1/2 second off (assuming a 4mhz crystal).

HTH,

BobK