MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -Accumulator. The accumulator, register A, is used for all arithmetic and logic operations.

Detailed explanation-2: -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-3: -There are different types of registers, including memory address registers, memory buffer registers, input output address registers, and input output buffer registers and shift registers.

Detailed explanation-4: -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.

Detailed explanation-5: -The Accumulator (AC) register is a general purpose processing register. The instruction read from memory is placed in the Instruction register (IR). The Temporary Register (TR) is used for holding the temporary data during the processing. The Input Registers (IR) holds the input characters given by the user.