Thanks Peter, it could be posible that my simulator is very poor. Could I get some good simulator by INTERNET ? I just have this version of FRANKLIN SOFTWARE INC.
As I said Peter, this small program this small program is just to test P3.0 (TXD), because my program is another one and is huge program, is involved with RTC DS12C887 and NVRAM DS12225AB. I discovered two days ago errors on bad wired cables, I solved that, I can see working P0 & P2, but I can see nothing at P3.0 and I dont know why. When I write to SBUF some information, this could be send by TXD right ? why I can not see that, that's the big deal