What does the word "Buffer" means in which we store the data and not the address of that data like MBR Posted by Soman Khan , Wednesday, February 24, 2010 at 6:12 AM, in

Buffer is a register inside the CPU which stores data when it is read
from the memory. Just like IR, whenever an "instruction" is read, it
is stored inside Instruction Register, whenever "data" is read, it
comes into Memory Buffer Register (MBR) and stored inside the CPU
before being used.

Accumulator is also a register which is connected directly to the ALU
and provides data to the ALU for computation. Accumulator is also
filled with data which comes from MBR.