The Power On Self Test Essay

1939 words - 8 pages

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 ...view middle of the document...

Usually Cx386DX, Cx486DX, etc..· Numeric Processor: Present if you have a FPU or None on the contrary. If you have a FPU and the BIOS does not recognize it, see section Numeric Processor Test in Advanced CMOS Setup.· Floppy Drive A: The drive A type. See section Floppy drive A in Standard CMOS Setup to alter this setting.· Floppy Drive B: Idem.· Display Type: See section Primary display in Standard CMOS Setup.· AMI or Award BIOS Date: The revision date of your BIOS. Useful to mention when you have compatibility problems with adaptor cards (notably fancy ones).· Base Memory Size: The number of KB of base memory. Usually 640.· Ext. Memory Size: The number of KB of extended memory.In the majority of cases, the summation of base memory and extended memory does not equal the total system memory.For instance in a 4096 KB (4MB) system, you will have 640KB of base memory and 3072KB of extended memory, a total of 3712KB.The missing 384KB is reserved by the BIOS, mainly as shadow memory (see Advanced CMOS Setup).· Hard Disk C: Type: The master HDD number. See Hard disk C: type section in Standard CMOS Setup.· Hard Disk D: Type: The slave HDD number. See Hard disk D: type section in Standard CMOS Setup.· Serial Port(s): The hex numbers of your COM ports. 3F8 and 2F8 for COM1 and COM2.· Parallel Port(s): The hex number of your LTP ports. 378 for LPT1.· Other information: Right under the table, BIOS usually displays the size of cache memory.Common sizes are 64KB, 128KB or 256KB. See External Cache Memory section in Advanced CMOS Setup.AMI BIOS POST ErrorsDuring the POST routines, which are performed each time the system is powered on, errors may occur.Non-fatal errors are those which, in most cases, allow the system to continue the boot up process.The error messages normally appear on the screen.Fatal errors are those which will not allow the system to continue the boot-up procedure.If a fatal error occurs, you should consult with your system manufacturer or dealer for possible repairs.These errors are usually communicated through a series of audible beeps.The numbers on the fatal error list correspond to the number of beeps for the corresponding error.All errors listed, with the exception of #8, are fatal errors. All errors found by the BIOS will be forwarded to the I/O port 80h.· 1 beep: DRAM refresh failure. The memory refresh circuitry on the motherboard is faulty.· 2 beeps: Parity Circuit failure. A parity error was detected in the base memory (first 64k Block) of the system.· 3 beeps: Base 64K RAM failure. A memory failure occurred within the first 64k of memory.· 4 beeps: System Timer failure. Timer #1 on the system board has failed to function properly.· 5 beeps: Processor failure. The CPU on the system board has generated an error.· 6 beeps: Keyboard Controller 8042-Gate A20 error. The keyboard controller (8042) contains the...

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