Specifications

Troubleshooting and Error Messages
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Beep Code POST CODE Checkpoint Description
84h Detect and install external parallel ports
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 local bus hard disk controller
92h Jump to UserPatch2
94h Disable A20 address line
96h Clear huge ES segment register
98h Search for option ROMs
9Ah Shadow option ROMs
9Eh Enable hardware interrupts
A0h Set time of day
A2h Check keylock
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
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
Table 5-2. POST Checkpoint Codes (cont.)
Beep Code POST Code Checkpoint Description
D0h Interrupt handler error
D2h Unknown interrupt error
D4h Pending interrupt error
D6h Initialize option ROM error
D8h Shutdown error
DAh Extended Block Move