Central Processing Units

About The CPU

CPU stands for Central Processing Unit. It is the part of the computer that carries out the programs given to it and does basic arithmetic, logic, and input/output operations.

CPUs are different depending on what computer type you are using. On large computers, one or more printed printed circuit boards (used to connect electronic components) are needed. On personal computers and laptops, CPUs can be found in a single silicon chip called a microprocessor. Two typical components of a CPU are an Arithmetic Logic Unit (ALU) and a Control Unit (CU). The ALU performs the mathematical things, and the CU extracts instructions from the Memory and executes them.

The History of the CPU

Before CPUs, computers had to be rewired to perform different tasks. These computers were called "Fixed Program Computers". CPUs came with the advent of "Stored Program Computers". On June 30 1945, Jon Von Neumann created and distributed a paper outlining the design of a stored program computer. This computer would perform a set of instructions that would combine to create programs. The computer was finished in August 1949, and the CPU was born.

Procedures of CPUs

When you double click on a program...

The program in the hard disk is transferred to the RAM (random access memory) memory.


The CPU uses a circuit called Memory Controller to load the program data from the RAM memory.


The data is now inside the CPU, where it is processed.


The program then tells the CPU what to do, like carry on loading some more or display something on screen.