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Operating Systems Concepts - Engineering

Q1:

Addressing structure

A defines the fundamental method of determining effective operand addresses

B are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

C performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

D all of the above

E None of the above

ANS:A - defines the fundamental method of determining effective operand addresses

The various addressing modes that are defined in a given instruction set architecture define how machine language instructions in that architecture identify the operand (s) of each instruction. An addressing mode specifies how to calculate the effective memory address of an operand by using information held in registers and/or constants contained within a machine instruction or elsewhere.