hello, I'm using the C167 with Keil and I'm printing out some text in the serial window #1 (COM1) for this I initialize the serial interface */ P3 |= 0x0400; DP3 |= 0x0400; /* SET PORT 3.10 DP3 &= 0xF7FF; S0TIC = 0x80; S0RIC = 0x00; S0BG = 0x40; S0CON = 0x8011; IT WORKS !!!!!!! my problem: In the next step I wanted to use the COM2 - serial Window #2 Now I have to initialize the port 3.9 and 3.8 but after starting the programm nothing happnes in Serial window #2 and I don't understang why because it works in Window #1 pleas help me --------thx-----------