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PS2 style plugs were used prior to USB style plugs.

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Q: What ports were used before usb ports to connect devices to the system unit?
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Serial ports and parallel ports have long been used to connect input and output devices to the computer?

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What are different type of input ports commonly available on a modern computer?

The PS/2 ports connect a mouse and keyboard, while the game port connects game controllers. Parallel and serial ports connect older printers and PDA devices. Most current input devices use the USB port, of which there are usually several available on a modern computer. Firewire ports connect high-speed devices, including DV cameras and Firewire hard drives. Another high-speed hard drive connector is the eSATA port.


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The interface through which external devices are connected to your computer is an?

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