AC450NX Rack Server System Product Guide
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Port 80h Codes (continued)
CP Beeps Reason
80 Detect and install external RS232 ports
82 Detect and install external parallel ports
85 Initialize PC-compatible PnP ISA devices
86 Reinitialize onboard I/O ports
88 Initialize BIOS Data Area
8A Initialize Extended BIOS Data Area
8C Initialize floppy controller
90 Initialize hard disk controller
91 Initialize local bus hard disk controller
92 Jump to UserPatch2
93 Build MPTABLE for multiprocessor boards
94 Disable A20 address line
95 Install CD ROM for boot
96 Clear huge ES segment register
98 1-2 Search for option ROMs; one long beep and two short beeps on
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9A Shadow option ROMs
9C Set up Power Management
9E Enable hardware interrupts
A0 Set time of day
A2 Check key lock
A4 Initialize typematic rate
A8 Erase F2 prompt
AA Scan for F2 key stroke
AC Enter SETUP
AE Clear in-POST flag
B0 Check for errors
B2 POST done—prepare to boot operating system
B4 1 One short beep before boot
B5 Display MultiBoot menu
B6 Check password (optional)
B8 Clear global descriptor table
BC Clear parity checkers
BE Clear screen (optional)
BF Check virus and backup reminders
C0 Try to boot with INT 19
D0 Interrupt handler error
D2 Unknown interrupt error
D4 Pending interrupt error
continued