>      Friends,    I'm building a led chaser whit a  12C508 Pic
>microcontroller. I  configure GPO, GP1, GP2, GP4 as outputs to drive the
>leds. I'm having the following  trouble:   When I plugin the circuit, it
>starts at function  whit label "cizq", but it should starts at function
>labeled  "izq".   if you trace the program from mplab  simulator it's seem
>to have no problem.   Sometimes the circuit does not start,  the only
>thing that you can see in the leds it's a  shadow.   I'm sending you the
>source code.   Whoever can help me, I'll be very  thanked.   NOTE:   Pin
>configuration:   Watch dog timer: OFF Code protect : OFF  Oscilator:
>External  Master Clear Reset: Internal     Ivan Cano Medellin -

Just had a quick look at your code - are you using TRIS correctly? This
instruction determines if a pin is an input or output. Generally, you only
use it in your initialization stages, and you use 'MOVWF GPIO' when you
want to set or clear output bits. Worth a look.

        Jim