The Power On Self Test
When the system is powered on, the BIOS will perform diagnostics and initialize
system components, including the video system. (This is self-evident when the
screen first flicks before the Video Card header is displayed). This is commonly
referred as POST (Power-On Self Test).
Afterwards, the computer will proceed its final boot-up stage by calling the
operating system. Just before that, the user may interrupt to have access to
SETUP.
To allow the user to alter the CMOS settings, the BIOS provides a little program,
SETUP. Usually, setup can be entered by pressing a special key combination (DEL,
ESC, CTRL-ESC, or CRTL-ALT-ESC) at boot time (Some BIOSes allow you to enter
setup at any time by pressing CTRL-ALT-ESC). The AMI BIOS is mostly entered by
pressing the DEL key after resetting (CTRL-ALT-DEL) or powering up the computer.
You can bypass the extended CMOS settings by holding the key down during
boot-up. This is really helpful, especially if you bend the CMOS settings right
out of shape and the computer won't boot properly anymore. This is also a handy
tip for people who play with the older AMI BIOSes with the XCMOS setup. It
allows changes directly to the chip registers with very little technical
explanation.
A Typical BIOS POST Sequence
Most BIOS POST sequences occur along four stages:
1. Display some basic information about the video card like its brand,
video BIOS version and video memory available.
2. Display the BIOS version and copyright notice in upper middle screen.
You will see a large sequence of numbers at the bottom of the screen. This
sequence is the .
3. Display memory count. You will also hear tick sounds if you have enabled
it (see Memory Test Tick Sound section).
4. Once the POST have succeeded and the BIOS is ready to call the operating
system (DOS, OS/2, NT, WIN95, etc.) you will see a basic table of the system's
configurations:
ยท Main Processor: The type of CPU identified by the BIOS. Usually Cx386DX,... [continues]
When the system is powered on, the BIOS will perform diagnostics and initialize
system components, including the video system. (This is self-evident when the
screen first flicks before the Video Card header is displayed). This is commonly
referred as POST (Power-On Self Test).
Afterwards, the computer will proceed its final boot-up stage by calling the
operating system. Just before that, the user may interrupt to have access to
SETUP.
To allow the user to alter the CMOS settings, the BIOS provides a little program,
SETUP. Usually, setup can be entered by pressing a special key combination (DEL,
ESC, CTRL-ESC, or CRTL-ALT-ESC) at boot time (Some BIOSes allow you to enter
setup at any time by pressing CTRL-ALT-ESC). The AMI BIOS is mostly entered by
pressing the DEL key after resetting (CTRL-ALT-DEL) or powering up the computer.
You can bypass the extended CMOS settings by holding the key down during
boot-up. This is really helpful, especially if you bend the CMOS settings right
out of shape and the computer won't boot properly anymore. This is also a handy
tip for people who play with the older AMI BIOSes with the XCMOS setup. It
allows changes directly to the chip registers with very little technical
explanation.
A Typical BIOS POST Sequence
Most BIOS POST sequences occur along four stages:
1. Display some basic information about the video card like its brand,
video BIOS version and video memory available.
2. Display the BIOS version and copyright notice in upper middle screen.
You will see a large sequence of numbers at the bottom of the screen. This
sequence is the .
3. Display memory count. You will also hear tick sounds if you have enabled
it (see Memory Test Tick Sound section).
4. Once the POST have succeeded and the BIOS is ready to call the operating
system (DOS, OS/2, NT, WIN95, etc.) you will see a basic table of the system's
configurations:
ยท Main Processor: The type of CPU identified by the BIOS. Usually Cx386DX,... [continues]
Cite This Essay
- APA
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(1999, 10). The Power on Self Test. StudyMode.com. Retrieved 10, 1999, from http://www.studymode.com/essays/Power-Self-Test-872.html
- MLA
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"The Power on Self Test" StudyMode.com. 10 1999. 10 1999 <http://www.studymode.com/essays/Power-Self-Test-872.html>.
- CHICAGO
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"The Power on Self Test." StudyMode.com. 10, 1999. Accessed 10, 1999. http://www.studymode.com/essays/Power-Self-Test-872.html.
