MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -An accumulator is primarily used as a register in a CPU to store intermediate logical or arithmetic data in multistep calculations. For such calculations, it functions as a temporary storage location.

Detailed explanation-2: -In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU’s control unit that holds the instruction currently being executed or decoded.

Detailed explanation-3: -Register A is quite often called as an Accumulator. An accumulator is a register for short-term, intermediate storage of arithmetic and logic data in a computer’s CPU (Central Processing Unit). In an arithmetic operation involving two operands, one operand has tobe in this register.

Detailed explanation-4: -An accumulator is a type of register included in a CPU. It acts as a temporary storage location which holds an intermediate value in mathematical and logical calculations. Intermediate results of an operation are progressively written to the accumulator, overwriting the previous value.

Detailed explanation-5: -Therefore, most of the instructions in the instruction set refer to the accumulator (e.g., the 6502 is an accumulator-based microprocessor). The purpose of all the microprocessors internal registers of 6502 is predefined by the manufacturer. Therefore, these are special purpose registers.