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The 3.5 mm headphone jack lets you connect stereo headphones
or other audio-output devices, such as external speakers.
Connecting headphones or other devices to this jack automatically
disables the internal speakers.
The parallel port lets you connect a parallel printer, or other
parallel device, including ECP-compatible devices.
DEFINITION: ECP (Extended Capabilities Port) is a
parallel-port standard for PCs that support bi-directional
communication between the PC and attached devices (such
as a printer).
Use the serial port to connect a serial mouse, serial printer, or
other serial device.
The monitor port allows you to connect an external monitor.
The USB (Universal Serial Bus) ports allow you to connect USB
peripherals to your computer, such as a keyboard, pointing device,
printer, or monitor.
DEFINITION: USB is a peripheral expansion standard that
supports a data-transfer rate of up to 12 Mbps. USB
peripherals have a single standard for cables and
connectors.
The USB standard allows you to install and remove USB
devices while the computer is on. Switching devices without
turning off the computer is called “hot swapping.”