|port||address||IRQ (Interrupt Request)|
The serial port is going the way of the dodo bird, replaced by the USB port which has smaller simpler cables and the ability to double your ports using a splitter.
Computers used to have serial ports built in to the motherbord. They do not anymore. If you want a serial port, you must add a serial card. Such cards used to cost about $10. Now, as a specialty item, they start at $40 and go up into the hundreds of dollars. Make sure you get one designed to fit one of your free slots. For maxium compatibility, you want want with an actual 16950 UART (Universal Asynchronous Receiver/Transmitter) chip on it. You will not likely find one locally. You will have to buy one on the Internet.
NCIX carries serial port cards, including some inexpensive ones.
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