Just found these warnings.... serial.c: In function `ttysetup': serial.c:372: warning: unsigned int format, tcflag_t arg (arg 4) serial.c:373: warning: unsigned int format, tcflag_t arg (arg 4) serial.c:374: warning: unsigned int format, tcflag_t arg (arg 4) serial.c:375: warning: unsigned int format, tcflag_t arg (arg 4) Andrew