CPU

﻿﻿CPU
(Central Processing Unit) ﻿﻿The CPU is the "brain" of the computer, all instruccions are carried on the CPU. It has 3 parts:

>  The speed of a computer is measured in Hertz (Hz). The speed is measured corresponded to the number of actions the CPU can do every second.
 * 1) Control Unit
 * 2) Arithmetic Logic Unit ( ALU)
 * 3) Immediate Access Store (IAS) 

 **Memory** **﻿**  There are two types of memories, internal and external. Internal memory has also two types RAM and ROM. **RAM (﻿ ﻿Ran﻿dom Access Memory)** **R**andom **A**ccess **M**emory stores temporally instructions that the computer is running or data that is processing. It is __Volatile,__ this means that when the power is turn off, the stored data in the RAM is lost. When you run a computer RAM is storing the following data: > >
 * 1) The __operating system__ software
 * 2) <span style="display: block; font-family: arial,helvetica,sans-serif; font-size: 130%; text-align: justify;">The __application software__ currently being used
 * 3) <span style="display: block; font-family: arial,helvetica,sans-serif; font-size: 130%; text-align: justify;">Any __data__ that is being processed

<span style="display: block; font-family: arial,helvetica,sans-serif; font-size: 130%; text-align: justify;">**﻿ ROM (Read Only Memory)** <span style="display: block; font-family: arial,helvetica,sans-serif; font-size: 130%; text-align: justify;">
 * R**ead **O**nly **M**emory is a permanent memory, which most computer use to hold a small software called BIOS (Basic Input Output System). When the software is turn on, this software checks the computer hardware and then loads the operating system this one has. This is a non-volatile software, even if the power is turned on the data won't be lost.