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Troubleshooting 91
84h Detect and install external parallel ports
85h Initialize PC-compatible PnP ISA devices
86h Re-initialize onboard I/O ports
87h Configure mainboard configurable devices (optional)
88h Initialize BIOS data area
89h Enable non-maskable interrupts
8Ah Initialize extended BIOS data area
8Bh Test and initialize PS/2 mouse
8Ch Initialize diskette controller
8Fh Determine number of ATA drives (optional)
90h Initialize hard drive controllers
91h Initialize local-bus hard drive 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 multi-processor table
98h 1-2 Search for option ROMs. Beeps on checksum failure
99h Check for SMART drive (optional)
9Ah Shadow option ROMs
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 F2 prompt
AAh Scan for F2 keystroke
ACh Enter SETUP
AEh Clear boot flag
B0h Check for errors
Test
Point
Beep
Code
POST Routine Description
* If the BIOS detects error 2C or 2E, it displays an additional word-bitmap (xxxx) indicating
the address line or bits that failed. For example, “2C 0002” means address line 1 (bit one
set) has failed. “2E 1020” means data bits 12 and 5 (bits 12 and 5 set) have failed in the
lower 16 bits.
8507328.book Page 91 Thursday, February 15, 2001 11:28 AM