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36 T
ROUBLESHOOTING
P
RESARIO
N
OTEBOOK
M
AINTENANCE
AND
S
ERVICE
G
UIDE
1200XL S
ERIES
Presario 1200 Series
Models: XL101-XL113, XL115, XL118-XL127
49h Initialize all video adapters in system
4Ah QuietBoot start (optional)
4Bh Shadow video BIOS ROM
4Ch Display BIOS copyright notice
4Eh Display CPU type and speed
50Eh Initialize EISA board
51h Test keyboard
52h Set key click if enabled
54h Test for unexpected interrupts
58h Initialize POST display service
59h Display prompt "Press F2 to enter SetUP"
5Ah Disable CPU cache
5Bh Test RAM between 512 and 640 KB
5Ch Test extended memory
60h Test extended memory address lines
62h Jump to UserPatchI
64h Configure advanced cache registers
66h Initialize Multi Processor APIC
67h Enable external and CPU cache
68h Setup System Management Mode (SMM) area
69h Display external L2 cache size
6Ah Load custom defaults (optional)
6Bh Display shadow-area message
6Ch Display possible high address for UMB recovery
6Eh Display error messages
70h Check for configuration errors
72h Check for keyboard errors
76h Set up hardware interrupt vectors
7Ch Initialize coprocessor if present
7Eh Disable onboard Super I/O ports and IRQs
80h Late POST device initialization
Code Beeps POST Routine Description