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Question

The format of double operand instruction of a CPU consist of 5 bits opcode and 6 bits for source and destination. 26 double operand instructions and 184 single operand instructions must be implemented. What will be the total number of zero operand instructions can be implemented?

given answer is: 12800

Comments

Any one please help in this question as I was getting 12288.

Answer 1

Variable length addressing is used.

$\Rightarrow [\{(2^5-26)\times2^6\}-184]\times 2^6$

$\Rightarrow200 \times 64=12800$