Chapter 2: Serial Interface—The COM Port Overview The universal peripheral serial interface—the COM port (Communications Port)—has been present in PCs since the first models. This port provides asynchronous[1] data transfer employing the RS-232C standard. COM ports are implemented using Universal Asynchronous Receiver-Transmitter (UART) ICs compatible with the i8250/16450/16550 software model. They each occupy eight adjacent […]
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