obiwan:~ # setserial /dev/ttyS3 uart 16550A port 0x2e8 irq 3 spd_vhi obiwan:~ # setserial -bg /dev/ttyS3 /dev/ttyS3 at 0x02e8 (irq = 3) is a 16550A (spd_vhi) obiwan:~ # stty crtscts < /dev/ttyS3