Suppose that ES= 6DF2, DS=83AC, SS=EBD2, AX=B75, DI=DC7, BP=51A, SI=FB3, REN=75D and YEN=A8E. Determine the address accessed by each of the following instructions and state what addressing mode is used: 
 a. MOV REN[DI][AX][9F], BX b. MOV BL, YEN[BP+SI-72A]

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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.