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80
Additional Bus Checkpoints
While control is in the bus routines, additional checkpoints are ouput to
I/O port address 0080h as word to identify the routines being executed.
These are word checkpoints. The low byte of checkpoint is the system
BIOS checkpoint where control is passed to the different bus routines.
The high byte of checkpoint indicates that the routine is being executed
in different buses.
The high byte of these checkpoints includes the following information:
Beep Codes
Fatal errors, which halt the boot process, are communicated through a
series of audible beeps. If AMIBIOS POST can initialize the system
video display, it displays the error message. Displayed error messages,
in most cases, allow the system to continue to boot. Displayed error
messages are described on pages 82-83. See the top of the next page for
the beep code chart.
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Chapter 6
System Resources
