5-25
Problem Solving
Table 5-3. POST Tests (continued)
Code Beeps POST Routine Description
88 3-1-3-1 Initialize BIOS Data Area
8A 3-1-3-3 Initialize Extended BIOS Data Area
8C 3-1-4-1 Initialize floppy controller
90 3-2-1-1 Initialize hard disk drives
91 3-2-1-2 Initialize local-bus hard-disk controller
92 3-2-1-3 Jump to UserPatch2
94 3-2-2-1 Disable A20 address line
96 3-2-2-3 Clear huge ES segment register
98 3-2-3-1 Search for option ROMs. One long, two short beeps on checksum failure
9A 3-2-3-3 Shadow option ROMs
9C 3-2-4-1 Set up Power Management
9E 3-2-4-3 Enable hardware interrupts
A0 3-3-1-1 Set time of day
A2 3-3-1-3 Check key lock
A8 3-3-3-1 Erase F2 prompt
AA 3-3-3-3 Scan for F2 keystroke
AC 3-3-4-1 Enter SETUP
AE 3-3-4-3 Clear in-POST flag
B0 3-4-1-1 Check for errors
B2 3-4-1-3 POST done - prepare to boot operating system
B4 3-4-2-1 One short beep before boot
B6 3-4-2-3 Check password (optional)
B8 3-4-3-1 Clear global descriptor table
BC 3-4-4-1 Clear parity checkers
BE 3-4-4-3 Clear screen (optional)
BF 3-4-4-4 Check virus and backup reminders
C0 4-1-1-1 Try to boot with INT 19
D0 4-2-1-1 Interrupt handler error
D2 4-2-1-3 Unknown interrupt error
D4 4-2-2-1 Pending interrupt error
D6 4-2-2-3 Initialize option ROM error
D8 4-2-3-1 Shutdown error
DA 4-2-3-3 Extended Block Move
DC 4-2-4-1 Shutdown 10 error
DE 4-2-4-3 Keyboard Controller Failure
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