User`s manual

User’s Manual

Code (hex) Name Description

72 Install FDD Enter setup check and auto11 configuration check up Initialize

floppy disk drive controller and any drives. Install FDD and setup

BIOS data area parameters

73 Install FDD Initialize hard drive controller and any drives. IDE device

detection and install Initialize any serial and parallel ports (also

game port).

74 Detect & Initialize Math

Coprocessor

Initialize math coprocessor.

75 HDD Check for Write

protection

HDD check out

76 Reserved

77 Display POST error Check POST error and display them and ask for user intervention

Ask password security (optional).

78 CMOS and Option

ROM Init

Write all CMOS values back to RAM and clear screen. Enable

parity checker Enable NMI, Enable cache before boot. Initialize

any option ROMs present from C8000h to EFFFFh.

NOTE: When FSCAN option is enabled, ROMs initialize from

C8000h to F7FFFh.

79 Reserved

7A Reserved

7B Reserved

7C Reserved

7D Boot Medium detection Read and store boot partition head and cylinders values in RAM

7E Final Init Final init for last micro details before boot

7F Special KBC patch Set system speed for boot. Setup NumLock status according to

Setup.

80 Boot Attempt Set low stack Boot via INT 19h.

FF Boot