18
BIOS
|
Chapter
4
BIOS
BIOS
are
a
program
located
on
a
Flash
memory
chip
on
a
circuit
board.
It
is
used
to
initialize
and
set
up
the
I/O
peripherals
and
interface
cards
of
the
system,
which
includes
time,
date,
hard
disk
drive,
the
ISA
bus
and
connected
devices
such
as
the
video
display,
diskette
drive,
and
the
keyboard.
This
program
will
not
be
lost
when
you
turn
off
the
system.
The
BIOS
provides
a
menu
‐
driven
interface
to
the
console
subsystem.
The
console
subsystem
contains
special
software,
called
firmware
that
interacts
directly
with
the
hardware
components
and
facilitates
interaction
between
the
system
hardware
and
the
operating
system.
The
BIOS
default
values
ensure
that
the
system
will
function
at
its
normal
capability.
In
the
worst
situation
the
user
may
have
corrupted
the
original
settings
set
by
the
manufacturer.
All
the
changes
you
make
will
be
saved
in
the
system
RAM
and
will
not
be
lost
after
power
‐
off.
When
you
start
the
system,
the
BIOS
will
perform
a
self
‐
diagnostics
test
called
Power
On
Self
Test
(POST)
for
all
the
attached
devices,
accessories,
and
the
system.
Press
the
[Del]
key
to
enter
the
BIOS
Setup
program,
and
then
the
main
menu
will
show
on
the
screen.
Note
4:
Change
the
parameters
when
you
fully
understand
their
functions
and
subsequence.
