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4-11 Troubleshooting
CP Reason
8A Initialize Extended BIOS Data Area
8B Test and initialize PS/S mouse
8C Initialize floppy controller
90 Initialize hard disk controller
91 Initialize local bus hard disk controller
92 Jump to UserPatch2
93 Build MPTABLE for multi-processor boards
94 Disable A20 address line
95 Install CD-ROM for boot
96 Clear huge ES segment register
97 Fixup Multi Processor table
98 Search for option ROMs. One long, two short beeps on checksum failure
99 Check for SMART Drive
9A Shadow option ROMs
9C Set up Power Management
9D Initialize security engine
9E Enable hardware interrupts
A0 Set time of day
A2 Check key lock
A4 Initialize typematic rate
A8 Erase F2 prompt
A9 Prepare boot
AA Scan for F2 key stroke
AC Print bottom message
AE Clear the POST flag
B0 Check POST Error
B2 POST End
B4 Beep once
B5 End the Quiet Boot
B6 Check Password
B7 Configuration ACPI
B9 Prepare boot
BA DMI Configuration
BC Clear parity checkers
BD Display Boot Menu
BE Clear Screen
C0 INT19
C1 Initialize the POST Error Manager
C2 Invoke End of POST Error Logging
C3 Invoke End of POST Error Message Display
C6 Initialize Console Redirection
C7 Control Console Port
CD Initialize Console Redirection
D1 Initialize BIOS stack
D3 Find an A20-agnostic place in memory