Acer Z5700 Series Service Manual page 180

Checkpoint
0A Initializes the 8042 compatible Key Board Controller.
0B Detects the presence of PS/2 mouse.
0C Detects the presence of Keyboard in KBC port.
0E Testing and initialization of different Input Devices. Also, update the Kernel
Variables.Traps the INT09h vector, so that the POST INT09h handler gets control for
IRQ1. Uncompress all available language, BIOS logo, and Silent logo modules.
13 Early POST initialization of chipset registers.
20 Relocate System Management Interrupt vector for all CPU in the system.
24 Uncompress and initialize any platform specific BIOS modules. GPNV is initialized at
this checkpoint.
2A Initializes different devices through DIM.See DIM Code Checkpoints section of
document for more information.
2C Initializes different devices. Detects and initializes the video adapter installed in the
system that have optional ROMs.
2E Initializes all the output devices.
31 Allocate memory for ADM module and uncompress it. Give control to ADM module for
initialization. Initialize language and font modules for ADM. Activate ADM module.
33 Initializes the silent boot module. Set the window for displaying text information.
37 Displaying sign-on message, CPU information, setup key message, and any OEM
specific information.
38 Initializes different devices through DIM. See DIM Code Checkpoints section of
document for more information. USB controllers are initialized at this point.
39 Initializes DMAC-1 & DMAC-2.
3A Initialize RTC date/time.
3B Test for total memory installed in the system. Also, Check for DEL or ESC keys to limit
memory test. Display total memory in the system.
3C Mid POST initialization of chipset registers.
40 Detect different devices (Parallel ports, serial ports, and coprocessor in CPU, ... etc.)
successfully installed in the system and update the BDA, EBDA...etc.
52 Updates CMOS memory size from memory found in memory test. Allocates memory for
Extended BIOS Data Area from base memory. Programming the memory hole or any
kind of implementation that needs an adjustment in system RAM size if needed.
60 Initializes NUM-LOCK status and programs the KBD typematic rate.
75 Initialize Int-13 and prepare for IPL detection.
78 Initializes IPL devices controlled by BIOS and option ROMs.
7C Generate and write contents of ESCD in NVRam.
84 Log errors encountered during POST.
85 Display errors to the user and gets the user response for error.
87 Execute BIOS setup if needed / requested. Check boot password if installed.
8C Late POST initialization of chipset registers.
8D Build ACPI tables (if ACPI is supported)
8E Program the peripheral parameters. Enable/Disable NMI as selected
90 Initialization of system management interrupt by invoking all handlers. Please note this
checkpoint comes right after checkpoint 20h
A1 Clean-up work needed before booting to OS.
Chapter 4
Description
170