Hallo all, maybe someone can help me. I must have 2 RS232 Ports on my atmel x51 controler, but on the web you only can find examples in ASM, and i have big Problems to call an ASM routine from my C-Program. Does someone have a C-Code for an RS232 (polling mode ;-) ), or can someone help me to implement ASM Code into my C-programm ,please ?. If it help's i can send you the RS232 ASM Code. Greetings markus