ITHELPDESK

Boot Sequences of the Operating System When we press the power button, If there is proper voltage, a short is created and send a pulse command to PSU (Power supply unit) to give power to all the devices and to send reset signals to the processor(CPU).                                                                                                                                                                                           CPU has the instruction pointer pointing to the reset vector within the system ROM and ...

BIOS - Basic Input Output System is a software that consists all the code required to control the disk drives, keyboard, mouse, display screen, serial ports and several other PC components.  Act as a bridge between hardware & OS while booting. Like a nervous system in our body. BIOS monitors hardware changes (Hardware Independence) It is placed in motherboard’s EEPROM (Electrically Erasable Programmable Read Only Memory) chip. Cards like sound cards, Graphic cards has inbuilt BIOS chip called ROM BIOS chip. Booting Process When the CPU is switched ON, BIOS starts working. First it shows chipset type, processor name, size of memory. After that, BIOS reads details in CMOS (Complementary Metal Oxide Semiconductor chip).  CMOS is a RAM which is powered by small button battery to keep it ON when PC is OFF. Information about time, date, boot device etc. will be there in CMOS. This information can be changed by entering into the setup menu while booting. Next, BIOS ...