Thanks Lawrence for your advice, as a matter of fact I did that befre see your post. I wanted to check if the basic minimum system was working good. I found a wrong wired pin in the EPROM, then I did a small program:

ORG 0
MOV IP,#00H
MOV IE,#00H
MOV A,055H
JUMPER: MOV SBUF,A
JMP JUMPER

This program put 10101010 at P3, and then I knew the system was working good, I saw 1's & 0`s at P3.
I tested a program gived by Hal, it send ASCII characters to buffer, in Franklin simulator works ok, but in the hardware still can not see the signal toggling between 0 & 1 where (TXD P3.1) I should see them. I am using Logic Dart, with this device I can see signals at P0 & P2, PSEN & ALE.