In a computer laboratory all system are 22 bit and support 4KW memory. There are two types of instructions are placed in memory(one address and zero address). If there exist 1k one address instructions then how many zero address are possible?

(A) 0 instruction
(B) 1024 instruction
(C) 2048 instruction
(D) None of these.


Answer: (A)

Explanation: System have 22 bit address Instruction format
Memory is 4KW i.e. 2¹² word
It will take 12 bit and rest of 10 bits are reserved for opcode.
I.e. 1024 total instructions are possible.
It is given that there is 1024 one addresses instruction.
It means there is no place for 0 address instruction.
So, option (A) is correct.


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