Technical Reference 93
Table 11. Post Codes (continued)
Diagnostic LED Decoder
G=Green, R=Red, A=Amber
Post
Code
MSB LSB
Description
19h G Off Off A
Init System Timer: The 8254 timer test is over. Starting the memory
refresh test next.
1Ah G Off G R
Check Refresh Toggle: The memory refresh line is toggling.
Checking the 15 second on/off time next
23h Off Off A G
Setup Interrupt Vectors: Reading the 8042 input port and disabling
the MEGAKEY Green PC feature next. Making the BIOS code
segment writable and performing any necessary configuration
before initializing the interrupt vectors
24h Off G R Off
Before Vector: Configuration is required before interrupt vector
initialization has completed. Interrupt vector initialization is about to
begin
25h Off G R G Init interrupt Vectors: Interrupt vector initialization is done.
F2h R R A R Initialize SMM handler. Initialize USB emulation.
F5h R A R A Validate NVRAM areas. Restore from backup if corrupted.
12h Off Off G R
Load defaults in CMOS RAM if bad checksum or CMOS clear
jumper is detected.
12h Off Off G R Initializing APP CMOS RAM for appliance servers only.
12h Off Off G R Check point After CMOS Initialized
27h Off G A G Validate date and time in RTC.
F4h R A R R Load Micro Code To All CPUs
F6h R A A R Scan SMBIOS GPNV areas
15h Off G Off A 8254 Timer Test on Channel 2
15h Off G Off A Enable 8042
15h Off G Off A Keyboard Reset
26h Off G A Off Initialize LCD, if supported.
28h G Off R Off
Set Video Mode: Initialization before setting the video mode is
complete. Configuring the monochrome mode and color mode
settings next.
29h G Off R G Debugger Hook
2Ah G Off A Off
Init PCI devices and motherboard devices. Pass control to video
BIOS. Start serial console redirection.
2Bh G Off A G Platform hook
2Dh G G R G
Initialize AMI display manager Module. Initialize support code for
headless system if no video controller is detected.
2Dh G G R G Scan flash for logos and Initialize logo data areas
30h Off Off R R Detect PS/2 Mouse
30h Off Off R R Hook after c000 ROM control
2Eh R R A Off Set up video parameters in BIOS data area.
37h Off G A A
Activate ADM: The display mode is set. Displaying the power-on
message next.
37h Off G A A Initialize language module. Display splash logo.
37h Off G A A Display Sign on message, BIOS ID and processor information.
38h G Off R R
Detect USB Mouse: Initializing the bus input, and general devices
next, if present.
34h Off G R R Reset IDE Controllers
continued
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