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On older computers, there was often a nine pin (or 25 pin) serial port for connecting modems, some other communications equipment or terminals, or special printers (like line printers, or receipt printers.)

These days, there are not many needs for a serial port, if you have any internet connection besides a modem.

If you do not use a modem, and do not need the serial port, disabling the port in your computer's BIOS (the "SETUP" screen that is announced right before your computer boots) then you may free up IRQs (computer resources) that allow other add-in cards and other peripherals to work better.

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Q: When might you need to disable a serial port on a motherboard?
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