Everytime you turn on your computer, the first thing you see is the BIOS application doing its thing. On plenty of machines, the BIOS displays text describing things like the amount of memory installed in your computer, the type of hard disk & so on. It turns out that, in the work of this boot sequence, the BIOS is doing a exceptional amount of work to get your computer prepared to run. This section briefly describes a number of those activities for a typical PC.After checking the CMOS Setup & loading the interrupt handlers, the BIOS determines whether the video card is operational. Most video cards have a miniature BIOS of their own that initializes the memory & graphics processor on the card. In the event that they do not, there is usually video driver knowledge on another ROM on the motherboard that the BIOS can load.Next, the BIOS checks to see if this is a cold boot or a reboot. It does this by checking the worth at memory address 0000:0472. A value of 1234h indicates a reboot, & the BIOS skips the remainder of POST. Anything else is thought about a chilled boot.If it is a chilled boot, the BIOS verifies RAM by performing a read/write check of each memory address. It checks the PS/2 ports or USB ports for a keyboard & a mouse. It looks for a peripheral part interconnect (PCI) bus &, if it finds, checks all the PCI cards. If the BIOS finds any errors in the work of the POST, it will notify you by a series of beeps or a text message displayed on the screen. A mistake at this point is always a hardware issue.
Everytime you turn on your computer, the first thing you see is the BIOS application doing its thing. On plenty of machines, the BIOS displays text describing things like the amount of memory installed in your computer, the type of hard disk & so on. It turns out that, in the work of this boot sequence, the BIOS is doing a exceptional amount of work to get your computer prepared to run. This section briefly describes a number of those activities for a typical PC.
After checking the CMOS Setup & loading the interrupt handlers, the BIOS determines whether the video card is operational. Most video cards have a miniature BIOS of their own that initializes the memory & graphics processor on the card. In the event that they do not, there is usually video driver knowledge on another ROM on the motherboard that the BIOS can load.
Next, the BIOS checks to see if this is a cold boot or a reboot. It does this by checking the worth at memory address 0000:0472. A value of 1234h indicates a reboot, & the BIOS skips the remainder of POST. Anything else is thought about a chilled boot.
If it is a chilled boot, the BIOS verifies RAM by performing a read/write check of each memory address. It checks the PS/2 ports or USB ports for a keyboard & a mouse. It looks for a peripheral part interconnect (PCI) bus &, if it finds, checks all the PCI cards. If the BIOS finds any errors in the work of the POST, it will notify you by a series of beeps or a text message displayed on the screen. A mistake at this point is always a hardware issue.
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