Describe the compare and test instructions for a microprocessor, including the two procedures by which comparisons may be performed.
What will be an ideal response?
Compare instructions compare data in the accumulator with data from a memory location or another register. The result of the comparison is not stored in the accumulator, but a flag bit might change as a result of it. Comparison may be performed by masking or bit-testing. Masking is a process of subtracting two numbers and allowing only certain bits through. The mask is a predetermined set of bits that is used to determine if certain conditions exist within the microprocessing unit. There is a disadvantage with the masking procedure because it uses an AND instruction and therefore destroys the content of the accumulator. The bit-testing procedure, although it also uses an AND instruction, does not destroy the content of the accumulator. Not all microprocessors have a bit-testing instruction.
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Convert as indicated giving the answer using proper significant figures.
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A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B