Cmos Reseach Paper

In: Computers and Technology

Submitted By andresouza
Words 805
Pages 4
BIOS, CMOS

Inside every PC out there is BIOS, which stands for Basic Input Output System. In a nutshell, BIOS is software that interacts between a computer’s hardware and the operating system and software applications. There are several types of BIOS', ranging from the motherboard ROM BIOS to adapter BIOS' such as video BIOS, drive controller BIOS, network adapter BIOS, SCSI adapter BIOS, etc... These BIOS' are the lowest level of software in a computer providing a set of small programs or software routines that allow the hardware of a computer to interact with the operating system by a set of standard calls.
The Boot Process
To get to the operating system, a computer must first boot from the BIOS. The BIOS performs a number of tasks when a computer is started. From initializing the microprocessor to initializing and testing hardware to starting the operating system. Starting a computer is not a simple task. It's a methodical process that is performed every time power is applied to computer. Here is a detailed description of the boot process. This process will vary with different computers and different BIOS', but the overall goal is the same. When you first turn on a computer the very first operation performed by the CPU is to read the address space at FFFF: 0000h. This address space it reads from is only 16 bytes, which is not nearly enough space to house the BIOS found on a motherboard. Instead, this location contains a special instruction called a jump command (JMP) that tells the processor where to go to find and read the actual BIOS into memory. The process of the processor reading the jump instruction and redirection to the actual BIOS is called the bootstrap or boot. So, when you apply power, it's not the operating system that's working. It's the BIOS.
Here is a basic rundown of what is happening:
1. Power is applied to the computer
When power is…...

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