http://tldp.org/HOWTO/Serial-HOWTO-4.html http://tldp.org/HOWTO/Serial-HOWTO-4.html http://www.tldp.org/HOWTO/Serial-HOWTO-4.html http://tldp.org/HOWTO/Serial-HOWTO-4.html http://www.tldp.org/HOWTO/Serial-HOWTO-4.html