Benefits of device controllers, Computer Engineering

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Q. Benefits of Device controllers?

Using device controllers for attaching I/O devices to a computer system in place of connecting them directly to system bus has subsequent benefits:

A device controller can be shared among many I/O devices permitting many I/O devices to be connected to system.
I/O devices can be easily changed or upgraded without any alteration in computer system.
I/O devices of manufacturers other than computer manufacturer can be easily plugged in to computer system. This offers more flexibility to users in buying I/O devices of their choice.

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