Question

Which of the following is not a normal register ?

• A. Accumulator
• B. Stack pointer
• C. Program counter
• D. Buffer

Answer 1

The correct option is A Accumulator

Accumulator is not a normal register.

In a computer’s central processing unit (CPU), an accumulator is a register in which intermediate arithmetic and logic results are stored.

Without a register like an accumulator, it would be necessary to write the result of each calculation (addition, multiplication, shift, etc.) to main memory perhaps only to be read right back again for use in the next operation. Access to main memory is slower than access to a register like the accumulator because the technology used for the large main memory is slower (but cheaper) than that used for a register.