4-22 Troubleshooting
69h Setup System Management Mode (SMM) area
6Ah Display external L2 cache size
6Bh Load custom defaults (optional)
6Ch Display shadow-area mess ag e
6Eh Display possible high addr ess for UMB recovery
70h Di spla y er ror me ssages
72h Check for configuration errors
76h Check for keyboard errors
7Ch Set up hardware interrupt vectors
7Eh Initialize coprocessor if present
80h Disable onboard Super I/O ports and IRQs
81h Late POST device initialization
82h Detect and inst all external RS232 port s
83h Configure non-MCD IDE controllers
84h Detect and install exter nal parallel ports
85h Initialize PC-compatible PnP ISA devices
86h Re-initialize onboa rd I/O ports
87h Configure Motherboard Configurable Devices (optional)
88h Initialize BIOS Area
89h Enable Non-Maskable Interrupts (NMIs)
8Ah Initialize Extended BIOS Data Area
8Bh Test and initialize PS/2 mouse
8Ch Initialize floppy controller
8Fh Determine number of ATA drives (optional)
90h Initialize hard-disk controllers
91h Initialize local-bus hard-disk 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 Fixup Multi Processor table
98h 1-2 Search for option ROMs. One long, two short beeps on
checksum failure.
Table 4-3. BIOS Beep Codes
Code Beeps POST Routine Description