FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -The CPU starts and fetches instructions into RAM from the BIOS, which is stored in the ROM. The BIOS starts the monitor and keyboard, and does some basic checks to make sure the computer is working properly. For example, it will look for the RAM. The BIOS then starts the boot sequence.

Detailed explanation-2: -The first thing a computer has to do when it is turned on is start up a special program called an operating system. The operating system’s job is to help other computer programs to work by handling the messy details of controlling the computer’s hardware.

Detailed explanation-3: -The Power On Self Test is the first task the BIOS performs when the computer is powered on. At the time of the POST, the BIOS verifies that the computer’s architecture can complete the initialization procedure. The system will typically produce a beep if the POST is executed correctly.

Detailed explanation-4: -Any piece of hardware containing files the computer needs to start is called a boot device. After testing and ensuring boot devices are functioning, BIOS loads the OS–or key parts of it–into the computer’s random access memory (RAM) from a hard disk or diskette drive (the boot device).

Detailed explanation-5: -In the first step of the boot process, the CPU activates the basic input/output system, or BIOS, a program that manages the exchange of data between the OS and the input and output devices attached to the system. The first job BIOS performs is to ensure that the computer’s peripheral devices are attached and working.