Input I would have thought.
If you are refering to the big readers of the 80-column punched card then they are Input devices. But many of these devices were made so that they could also be used for output - ie for punching cards - these are both Input and Output devices.
A card reader is an INPUT (not imput) device.
Whenever you are trying to categorize a device as Input or Output, think of how it looks from the computer.
If the computer is transmitting data to it, it is an Output device.
If the computer is receiving data from it, it is an Input device.
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It depends on the type of expansion slotslike PCI ports can be used to connect devices that accept Input (Serial Cards)or Output(PCI Parallel Cards) and AGP Expansion slotused for connecting Graphics Display (only Output)
They can be both, as with soundcards, you can input a microphone to them to input sound, but can also connect speakers, to output sound.
It's both... A network card is intended to allow a remote computer to 'talk' to a file-server. The data is both sent, and received by both computers.
An SD card is considered a storage device rather than an input or output device. It is used to store data such as photos, videos, and documents. When data is written to an SD card from a computer or camera, it is considered an output action, and when data is read from an SD card into a device, it is considered an input action.
output cuz it got swag
input device
Output
A keypad is an input device.