Graham, e-mail me your asm file let me look at it. I can't promise to respond right a way but I will. I have emulator with 509 probe. Andre Abelian > I still can not get any Leds to flash with my program for the 509. > > I have taken the advice of the people kind enough to send comments. > > If anyone has a simple led flashing program for the 509 stored away > somewhere, or if someone is willing to write one, please could you send it > to me! > > Please I need your help to make my christmas lights flash! > > Thanks > > Graham >