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UART Device

The RS-232 serial port was widely used in the 20th century for character I/O devices (teletype, printer, dumb terminal).

A pair of simplex channels (output and input) make it full duplex.

Additional wires are sometimes used for hardware flow control, or a software Xon/Xoff protcol can be used.

Baud rate and number of bits per words must be pre-agreeded.

(C) 2008-10, DJ Greaves, University of Cambridge, Computer Laboratory.