Specifications

EPC-6A Hardware Reference
38
Table 6-3. Phoenix
 NuBIOS Checkpoint Codes.
74h Test real-time clock
76h Check for keyboard errors
7Ah Test for key lock on
7Ch Set up hardware interrupts vectors
7Eh Test coprocessor if present
80h Disable onboard I/O ports
82h Detect and install external RS232 ports
84h Detect and install external parallel ports
85h Initialize PNP ISA devices
86h Re-initialize onboard I/O ports
88h Initialize BIOS Data Area
8Ah Initialize Extended BIOS Data Area
8Ch Initialize floppy controller
90h Initialize hard disk controller
91h Initialize localbus hard disk controller
92h Jump to UserPatch2
93h Build MPTABLE for multiprocessor boards
94h Disable A20 address line
95h Install CDROM for boot
96h Clear huge ES segment register
1-2 98h Search for option ROMs (beep for bad checksum)
9Ah Shadow option ROMs
9Ch Set up Power Management
9Eh Enable hardware interrupts
A0h Set time of day
A2h Check keylock
A4h Initialize typematic rate
A8h Erase F2 prompt
AAh Scan for F2 keystroke
ACh Enter SETUP
AEh Clear in-POST flag
B0h Check for errors
B2h POST done—prepare to boot operating system
B4h One beep
B5h Display MultiBoot menu
B6h Check password (optional)
B8h Clear global descriptor table
BCh Clear parity checkers
BEh Clear screen (optional)
BFh Check virus and backup reminders
C0h Try to boot with INT19
Beep code Post code Checkpoint description
D0h Interrupt handler error
Beep code Post code Checkpoint description