CPU, ALU, CU, PC, ACC, MAR, MDR, CIR, busses



The CPU carries out all instructions on the computer.

CPUs are made up of billions of transistors.

The rate of which a CPU works at is measured in giaghertz


Registers exist inside of the processor, so are extremely fast to use.

PC - The program counter, is a register which points to the memory address of the next instruction to fetch for the fetch-decode-execute cycle. It is usually incremented after either the fetch or the decode step, but can also be modified by branching instructions.

MDR - Memory Data Register, This register temporarily stores the last value stored/fetched from memory.

MAR - Memory Address Register, This register stores the address of where data should…


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