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Well, honey, a cash register is more of an output device. It's where the cashiers ring up your purchases and give you a receipt, not where you input information. So, technically speaking, a cash register is not an input device. But hey, who's really keeping track anyway?
Neither, it is not classified under input or output. It has its own identity
I expect you mean "Is Card reader/writer input or output?". If this is so, it is both an input and output 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.
A bar code scanner is an input device. While it does contain a laser, the laser is used to read the data, not to communicate anything to the user. The bar code scanner reads the UPC codes into the cash register or point of sale system.
A 'byte' is a unit of storage - not an input or output.