In the basic computer instruction format [I | opcode | address], which of the following do NOT represent memory-reference instructions?
A. mode = 1, opcode = 010
B. mode = 0, opcode = 111
C. mode = 1, opcode = 111
D. mode = 1, opcode = 110
E. mode = 1, opcode = 001
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Correct answer: A. B & C only
Explanation
In Mano's basic computer, opcode 111 is not a memory-reference instruction: with I = 0 it is a register-reference instruction and with I = 1 an input-output instruction. Opcodes 000–110 (with I = 0 direct or I = 1 indirect) are memory-reference instructions. So B and C.More Computer System Architecture questions
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