8666 N/B Maintenance8666 N/B Maintenance
7. Maintenance Diagnostics
7.1 Introduction
Each time the computer is turned on, the system bios runs a series of internal checks on the hardware. This power-
on self test (post) allows the computer to detect problems as early as the power-on stage. Error messages of post
can alert you to the problems of your computer.
If an error is detected during these tests, you will see an error message displayed on the screen. If the error occurs
before the display is initialized,then the screen cannot display the error message. Error codes or system beeps are
used to identify a post error that occurs when the screen is not available.
The value for the diagnostic port (378H) is written at the beginning of the test. Therefore, if the test failed, the user
can determine where the problem occurred by reading the last value written to port 378H by the Mini PCI debug
board.
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