Question

Explain different instruction formats in system programming

Answer 1

Answer:

Zero Address Instructions –

A stack based computer do not use address field in instruction.To evaluate a expression first it is converted to revere Polish Notation i.e. Post fix Notation.

One Address Instructions –

This use a implied ACCUMULATOR register for data manipulation.One operand is in accumulator and other is in register or memory location.Implied means that the CPU already know that one operand is in accumulator so there is no need to specify it.

Two Address Instructions –

This is common in commercial computers.Here two address can be specified in the instruction.Unlike earlier in one address instruction the result was stored in accumulator here result cab be stored at different location rather than just accumulator, but require more number of bit to represent address.

Three Address Instructions –

This has three address field to specify a register or a memory location. Program created are much short in size but number of bits per instruction increase. These instructions make creation of program much easier but it does not mean that program will run much faster because now instruction only contain more information but each micro operation (changing content of register, loading address in address bus etc.) will be performed in one cycle only.

Answer 2

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Above answer is absolutely right ^_^

KnOw more :--

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