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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 wont 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 OS2 NT WIN95 etc you will see a basic table of
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