Technical Reference 71
Table 13. Post Codes (continued)
Diagnostic LED Decoder
G=Green, R=Red, A=Amber
Post
Code MSB LSB
Description
0Fh G G G G Write Command Byte 8042: The initialization after the keyboard
controller BAT command test is done. The keyboard command
byte will be written next.
10h Off Off Off R Keyboard Init: The keyboard controller command byte is written.
Next, issuing the pin 23 and 24 blocking and unblocking
commands.
10h Off Off Off R Disable and initialize 8259.
11h Off Off Off A Detect Configuration Mode, such as CMOS clear.
13h Off Off G A Chipset Initialization before CMOS initialization.
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.
continued