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How an input and output pin can be both an input and output?

In: Computers, Computer Hardware, Computer Terminology [Edit categories]

Relevant answers:

Is a speakers an output input or both?
Speakers are a output device.
Which device is input and output both?
Computer Hard Disk Drive , USB Pen Drives, Computer Memories (RAM) etc. are all i/o Devices.
Which is an both input and output device?
all in one printer, which has scanner, printer, copier, and fax
Is a earphone input or output or both?
It is output because the device that it's connected to (computer, ipod etc) is putting out the music/noise to you.
Is a monitor an output input or both?
probably both

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