PORT 80 CODES
The following codes are presented on Port 80H as the BIOS performs its
reset procedure.
Code
Description
Uncompressed INIT code checkpoints:
C2
NMI is disabled. Power-on delay starting.
C5
Power-on delay complete. Going to disable cache if any.
C6
Calculating ROM BIOS checksum.
C7
ROM BIOS checksum passed. CMOS shutdown register test to be
done next.
C8
CMOS shutdown register test done. CMOS checksum calculation to
be done next.
CA
CMOS checksum calculation is done, CMOS diagnostic byte written.
CMOS status register about to init for date and time.
CB
CMOS status register init done. Any initialization before keyboard
BAT to be done next.
CD
BAT command to keyboard controller is to be issued.
CE
Keyboard controller BAT result verified. Any initialization after keyboard
controller BAT to be done next.
CF
Initialization after keyboard controller BAT done. Keyboard command
byte to be written next.
D1
Keyboard controller command byte is written. Going to check pressing
of <Ins> key during power-on.
D2
Checking for pressing of <Ins> key during power-on done. Going to
disable DMA and interrupt controllers.
D3
DMA controllers #1 and #2 and interrupt controllers #1 and #2 disabled.
Chipset init/auto memory detection about to begin.
D4
Chipset initialization/auto memory detection over. To uncompress the
RUNTIME code next.
D5
RUNTIME code is uncompressed.
DD
Transfer control to uncompressed code in shadow RAM at F000:FFF0.
BIOS MESSAGES
TECHNICAL REFERENCE
A-7
Summary of Contents for SB586TCP/166
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Page 11: ...SPECIFICATIONS TECHNICAL REFERENCE 1 3...
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