Acer Aspire 4743Z Aspire 4743 and 4743Z Notebook Series Service Guide - Page 202

Table 4-4. POST Codes POST Code Function 0x24 Set segment-register addressability to 4 GB Phase Component LBT Core 0xCC Redirect Int 10h to enable target board to use a remote serial video (PICO BIOS). LBT Core 0x8A Initialize Extended BIOS Data Area and initialize the mouse. LBT Core 0x9D Initialize Security Engine. LBT Core 0x55 USB Initialization LBT Core 0x52 Verify keyboard reset. LBT Core 0x54 Initialize keystroke clicker if enabled in Setup. LBT Core 0x76 Check status bits for keyboard-related failures. Display error messages on the screen. LBT Core 0x4A Initialize all video adapters in system LBT Core 0x4C Shadow video BIOS ROM if specified by Setup, and CMOS is valid and the previous boot was OK. LBT Core 0x59 Register POST Display Services, fonts, and languages with the POST Dispatch Manager. LBT Core 0x57 Initialize 1394 Firewire LBT Core 0xD6 Initialize PC card LBT Core 0x58 Test for unexpected interrupts. First do an STI for hot LBT interrupts. Secondly, test the NMI for an unexpected interrupt. Thirdly, enable the parity checkers and read from memory, checking for an unexpected interrupt. Core 0x3F ROMPolit memory init LBT Core 0xC4 Install the IRQ vectors (Sever Hotkey) LBT Core 0x7C Initialize the hardware interrupt vectors from 08 to 0F and LBT from 70h to 77H. Also set the interrupt vectors from 60h to 66H to zero. Core 0x41 ROM Pilot Init LBT Core 0x4B Initialize QuietBoot if it is installed. Enable both keyboard LBT and timer interrupts (IRQ0 and IRQ1). If your POST tasks require interrupts off, preserve them with a PUSHF and CLI at the beginning and a POPF at the end. Core 0xDE Initialize and UNDI ROM (fro remote flash) LBT Core 0xC6 Initial and install console for UCR LBT Core 0x4E Display copyright notice. LBT Core 0xD4 Get CPU branding string LBT Core 0x50 Display CPU type and speed LBT Core 4-28 Troubleshooting