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P
RESARIO
N
OTEBOOK
M
AINTENANCE
AND
S
ERVICE
G
UIDE
1200XL S
ERIES
T
ROUBLESHOOTING
37
Presario 1200 Series
Models: XL101-XL113, XL115, XL118-XL127
81h Detect and install external RS232 ports
82h Configure non-MCD IDE controllers
83h Detect and install external parallel ports
84h Initialize PC-compatible PnP ISA devices
85h Reinitialize onboard I/O ports
86h Configure Motherboard Configurable Devices (optional)
87h Initialize BIOS Data Area
88h Enable Non-Maskable Interrupts (NMIs)
89h Initialize Extended BIOS Data Area
8Ah Test and initialize PS/2 mouse
8Bh Initialize floppy controller
8Ch Determine number of ATA drives (optional)
81h Initialize hard disk controllers
90h Initialize local-bus hard disk controllers
91h Jump to UserPatch2
92h Build MPTABLE for multi-processor boards
93h Install CD ROM or DVD Drive for boot
95h Clear huge ES segment register
96h Fixup Multi Processor table
97h Search for option ROMs. One long, two short beeps on
checksum failure
98h Check for SMART drive (optional)
99h Shadow option ROMs
9Ah Set up Power Management
9Ch Initialize security engine (optional)
9Dh Enable hardware interrupts
9Eh Determine number of ATA and SCSI drives
9Fh Set time of day
A0h Check key lock
A2h Initialize Typematic rate
A4h Erase F2 prompt
Code Beeps POST Routine Description