Acer Altos G710 Service Manual page 88

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Diagnostic LED Decoder
Checkpoint
G=Green, R=Red, A=Amber
MSB
37
OFF
38
G
39
G
3A
G
3B
G
3C
G
40
OFF
50
OFF
52
OFF
60
OFF
75
OFF
78
G
7A
G
7C
G
84
R
85
R
87
R
8C
A
8D
A
8E
A
90
R
A0
R
A1
R
A2
R
A4
R
A7
R
A8
A
A9
A
AA
A
AB
A
AC
A
B1
R
00
OFF
Chapter 4
LSB
Displaying sign-on message, CPU information, setup key message,
G
A
A
and any OEM specific information.
Initializes different devices through DIM. See DIM Code Checkpoints
OFF
R
R
section of document for more information.
OFF
R
A
Initializes DMAC-1 and DMAC-2.
OFF
A
R
Initialize RTC date/time.
Test for total memory installed in the system. Also, Check for DEL or
OFF
R
A
ESC keys to limit memory test. Display total memory in the system.
G
R
R
Mid POST initialization of chipset registers.
Detect different devices (Parallel ports, serial ports, and coprocessor
R
OFF
OFF
in CPU, ... etc.) successfully installed in the system and update the
BDA, EBDA...etc.
Programming the memory hole or any kind of implementation that
R
OFF
R
needs an adjustment in system RAM size if needed.
Updates CMOS memory size from memory found in memory test.
R
G
R
Allocates memory for Extended BIOS Data Area from base memory.
R
R
OFF
Initializes NUM-LOCK status and programs the KBD typematic rate.
A
R
A
Initialize Int-13 and prepare for IPL detection.
R
R
R
Initializes IPL devices controlled by BIOS and option ROMs.
R
A
R
Initializes remaining option ROMs.
A
R
R
Generate and write contents of ESCD in NVRam.
G
OFF
OFF
Log errors encountered during POST.
G
OFF
G
Display errors to the user and gets the user response for error.
G
G
G
Execute BIOS setup if needed / requested.
G
OFF
OFF
Late POST initialization of chipset registers.
G
OFF
G
Build ACPI tables (if ACPI is supported)
G
G
OFF
Program the peripheral parameters. Enable/Disable NMI as selected
OFF
OFF
R
Late POST initialization of system management interrupt.
OFF
R
OFF
Check boot password if installed.
OFF
R
G
Clean-up work needed before booting to operating system.
Takes care of runtime image preparation for different BIOS modules.
Fill the free area in F000h segment with 0FFh. Initializes the Microsoft
OFF
A
OFF
IRQ Routing Table. Prepares the runtime language module. Disables
the system configuration display if needed.
G
R
OFF
Initialize runtime language module.
Displays the system configuration screen if enabled. Initialize the
G
A
G
CPU's before boot, which includes the programming of the MTRR's.
OFF
R
OFF
Prepare CPU for operating system boot including final MTRR values.
OFF
R
G
Wait for user input at config display if needed.
Uninstall POST INT1Ch vector and INT09h vector. Deinitializes the
OFF
A
OFF
ADM module.
OFF
A
G
Prepare BBS for Int 19 boot.
G
R
OFF
End of POST initialization of chipset registers.
OFF
R
A
Save system context for ACPI.
OFF
OFF
OFF
Passes control to OS Loader (typically INT19h).
Description
80

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