Hard wear
Mother Board
The main circuit
board of a microcomputer. The motherboard contains
the connectors for attaching additional boards.
Typically, the motherboard contains the CPU, BIOS, memory, mass storage interfaces, serial and parallel ports, expansion slots, and
all the controllers required to control standard peripheral devices, such
as the display screen, keyboard, and disk drive.
Collectively, all these chips that reside on the motherboard are known as the
motherboard's chipset.
Bios
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The BIOS is typically placed in a ROM chip that comes with the computer (it is often called a ROM
BIOS). This ensures that the BIOS
will always be available and will not be damaged by disk failures. It also
makes it possible for a computer to boot itself. Because RAM is faster than ROM, though, many computer manufacturers
design systems so that the BIOS is copied from ROM to RAM each time the computer is booted. This
is known as shadowing.
Memory battery
Every PC mother board has a battery. That battery serves
2 purposes: to feed the configuration memory (also called CMOS) and to feed the
real time clock of the computer (the one that show the date and the time)
