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26
Checkpoint
Beep Code
Code
3Ch
3Dh
41h
42h
45h
46h
2-1-2-3
47h
48h
Description
If CMOS is valid, load chipset registers with
values from CMOS, otherwise load defaults
and display Setup prompt. If Auto Configu-
ration is enabled, always load the chipset
registers with the Setup defaults.
Load alternate registers with CMOS values.
Register-table pointers are in the altreg-
table segment.
Initialize extended memory for RomPilot.
Initialize interrupt vectors 0 thru 77h to the
BIOS general interrupt handler.
Initialize all motherboard devices.
Verify the ROM copyright notice
Initialize support for I2O by initializing glo-
bal variables used by the I2O code. Pause
POST table processing if a CMOS bit is set
(for debugging).
Verify that the equipment specified in the
CMOS matches the hardware currently
installed. If the monitor type is set to 00
then a video ROM must exist. If the monitor
type is 1 or 2 set the video switch to CGA. If
monitor type 3, set the video switch to
mono. Also specify in the equipment byte
that disk drives are installed. Set appropri-
ate status bits in CMOS or the BDA if config-
uration errors are found.
3 Getting Started
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