Acer Aspire 4743Z Aspire 4743 and 4743Z Notebook Series Service Guide - Page 204

Table 4-4. POST Codes POST Code Function Phase Component 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 LBT devices. 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 LBT Core presence of external devices. 0x83 Configure Fisk Disk Controller. LBT Core 0xCE Initialize digitizer device and display installed message if LBT successful. Core 0x89 Enable non-maskable interrupts. LBT Core 0x8C Initialize both of the floppy disks and display an error LBT message if failure was detected. Check both drives to establish the appropriate diskette types in the TrustedCore data area Core 0xCB Redirect Int 13h to Memory Technologies Devices such as LBT ROM, RAM, PCMCIA, and serial disk (PICO BIOS). 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 LBT 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. 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 LBT check password. If the user does not enter a valid password, Setup does not return. Core 4-30 Troubleshooting