the diagram below, the chip on the right hand side, the 74HCT138, is provided with address information from the microprocessor and then activates one of its output lines to select a memory bank.  The 74HCT138 is   A multiplexer A demultiplexer An encoder A decoder A comparator

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A:

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Fundamentals of Input and Output Performance

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem includes disc controllers, tape drives, discs, system buses, and other devices. The I/O database application reads and writes drives using the operating system windows I/O.