User`s guide

BIOS POST Codes B-3
POST Code Description
70h Display error messages
72h Check for confi guration errors
76h Check for keyboard errors
7Ch Set up hardware interrupt vectors
7Dh Initialize Intelligent System Monitoring (optional)
7Eh Initialize coprocessor if present
80h Disable onboard Super I/O ports and IRQs (optional)
81h Late POST device initialization
82h Detect and install external RS232 ports
83h Confi gure non-MCD IDE controllers
84h Detect and install external parallel ports
85h Initialize PC-compatible PnP ISA devices
86h Re-initialize onboard I/O ports.
87h Confi gure Motherboard Confi gurable Devices (optional)
88h Initialize BIOS Data Area
89h Enable Non-Maskable Interrupts (NMIs)
8Ah Initialize Extended BIOS Data Area
8Bh Test and initialize PS/2 mouse
8Ch Initialize fl oppy controller
8Fh Determine number of ATA drives (optional)
90h Initialize hard-disk controllers
91h Initialize local-bus hard-disk controllers
92h Jump to UserPatch2
93h Build MPTABLE for multi-processor boards
95h Install CD ROM for boot
96h Clear huge ES segment register
97h Fix up Multi Processor table
98h 1-2 Search for option ROMs and shadow if successful. One long,
two short beeps on checksum failure
99h Check for SMART Drive (optional)
9Ch Set up Power Management
9Dh Initialize security engine (optional)
9Eh Enable hardware interrupts
9Fh Determine number of ATA and SCSI drives
A0h Set time of day
A2h Check key lock
A4h Initialize typematic rate
A8h Erase <ESC> prompt
AAh Scan for <ESC> key stroke
ACh Enter SETUP
AEh Clear Boot fl ag
B0h Check for errors
B1h Inform RomPilot about the end of POST (optional)
B2h POST done - prepare to boot operating system
B4h 1 One short beep before boot
B5h Terminate QuietBoot (optional)