BIOS 2

BIOS 2

Way of job of BIOS Motherboard.

After article BIOS 1, we picked acquaintance with what it's BIOS and Usefulness BIOS. At this article, I want to try pare the fig work the BIOS in general.

At Motherboard there are two laboring chip of equal to make the BIOS can work, that is commisioned chip CMOS saveing setting BIOS which have been arranged and containing Chip BIOS itself program the BIOS. BIOS [ on file Motherboard one of Chip ROM ( Read Only Memory). this Chip ROM can be in the form of the PROM ( programmable ROM), EPROM ( Erasable Programable ROM), EEPROM ( Electrically Erasable Programmable ROM) or Flash ROM. EPROM can only be vanished to use the ray of ultraviolet EEPROM can be vanished to use the larger voltage ones from normal stress used a the chip normal operasi moment. Fash ROM equal to EEPROM, but time needed briefer moment vanish and also moment refilled to be compared to EEPROM. Motherboard And ad-on card the present day most using type of Flash ROM.
Active Stroke BIOS.

At the time of computer flamed, first program multiply run is BIOS motherboard. In the following is sequence inisialisasi done by BIOS motherboard.
1. Inisialisasi Chipset found on motherboard.
2. Checking the availibility RAM of motherboard. If there is, BIOS chip BIOS of di-copy to RAM and later;then will be executed in RAM . Otherwise there are RAM, BIOS of hang.
3. Counting RAM found on motherboard and menginisialisasi memory controller at chipset.
4. Inisialisasi of Chip of other I/O controller chip and besides chipset.
5. Inisialisasi Cahce memory found on prosesor.
6. Inisialisasi Interrupt controller, inclusive of arranging IRQ ( Interupt Request) to be used by entire/all peripheral at motherboard and ad-on card attached motherboard.
7. Inisialisasi Graphic card. This matter conducted by copying the BIOS graphic card to RAM, later;then execute the the BIOS in RAM. After this process we will be able to see the appearance at screen computer. Usually, in the form of information BIOS used and certain logo.
8. Calculating size of harddisk or read its size measure from chip CMOS as according to size of harddisk which have been kept at previous chip CMOS.
9. Doing other inisialisasi.
10.Copy the bootloader operating system from sketch, CDROM, harddisk, or other peripheral boot to RAM then execute the the bootloader. Next bootloader deliver to conduct the computer to operating system.

Inisialisasi above is inisialisasi conducted BIOS in general. Every BIOS have the very depended specific inisialisasi from motherboard type.