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74
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.
stiBnoitpircseD
4-7stiB
0000.subehtnosecivedllaelbasiD.0noitcnuF
1000.subehtnosecivedcitatsezilaitinI.1noitcnuF
0100.subehtnosecivedtuptuoezilaitinI.2noitcnuF
1100.subehtnosecivedtupniezilaitinI.3noitcnuF
0010.subehtnosecivedLPIezilaitinI.4noitcnuF
1010.subehtnosecivedlarenegetaitinI.5noitcnuF
0110.subehtnognitroperrorreezilaitinI.6noitcnuF
1110.sesubllarofsMORno-ddaezilaitinI.7noitcnuF
0-3stiBsubehtyficepS
0.reganaMnoitazilaitinIeciveDMIDcireneG
1.secivedmetsySdraobnO
2.secivedASI
3.secivedASIE
4.secivedPnPASI
5.secivedICP
Chapter 6
System Resources
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