NIELIT 2017 OCT Scientific Assistant A (IT) - Section B: 5

Question

Which of the following is not a form of main memory?

• A. Instruction cache
• B. Instruction register
• C. Instruction opcode
• D. Translation look-aside buffer

Comments

Instruction Opcode is not a form of memory therefore option c is correct

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instruction opcode is basically operation an instruction when decoded.

instruction  consists of two part .1. opcode and 2. operand address

opcode when decoded contains the what type of opeartion (likd ADD, SUB,MUL etc.) is going to be performed.

wheras, 

1. instruction cache 
2. Instruction register       these are internal memory which cpu comunicates.

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https://gateoverflow.in/336930/Nielit-2017-oct-scientific-assistant-a-cs-section-c-2

Answer 1

option C will be correct.

A,B,D is all storing devices similar to main memory.