Acer Aspire 4743Z, Service Manual

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4-30 Troubleshooting
0xCA Redirect Int 15h to enable target board to use remote
keyboard (PICO BIOS). LBT Core
0x88 Initialize interrupt controller. LBT Core
0x81 Run late device initialization routines. LBT Core
0x87 Initialize motherboard configurable devices. LBT Core
0x85 Display any ESCD read errors and configure all PnP ISA
devices. LBT Core
0x82 Test and identify RS232 ports. LBT Core
0x84 Test and identify parallel ports. LBT Core
0x86 Initialize onboard I/O and BDA according to CMOS and
presence of external devices. LBT Core
0x83 Configure Fisk Disk Controller. LBT Core
0xCE Initialize digitizer device and display installed message if
successful. LBT Core
0x89 Enable non-maskable interrupts. LBT Core
0x8C Initialize both of the floppy disks and display an error
message if failure was detected. Check both drives to
establish the appropriate diskette types in the TrustedCore
data area LBT Core
0xCB Redirect Int 13h to Memory Technologies Devices such as
ROM, RAM, PCMCIA, and serial disk (PICO BIOS). LBT Core
0xCD Remap I/O and memory address space for PCMCIA
(PICO BIOS). LBT Core
0x90 Initialize hard-disk controller. If the CMOS ram is valid and
intact, and fixed disks are defined, call the fixed disk init
routine to initialize the fixed disk system and take over the
appropriate interrupt vectors. LBT Core
0x8B Setup interrupt vector and present bit in Equipment byte. LBT Core
0x95 1. Check CMOS for CD-ROM drive present
2. Activate the drive by checking for media present
3. Check sector 11h (17) for Boot Record Volume
Descriptor
4. Check the boot catalog for validity
5. Pick a boot entry
6. Create a Specification Packet
LBT Core
0x92 Jump to UserPatch2. LBT Core
0xB6 If password on boot is enabled, a call is made to Setup to
check password. If the user does not enter a valid
password, Setup does not return. LBT Core
Table 4-4. POST Codes
POST Code Function Phase Component