IBM 343 manual Post Code Port 80h Codes

Table 17. POST Code - Port 80h Codes

		Diagnostic LED Decoder
Post
		Note:	G=Green, R=Red,
Code		A=Amber					Description
		MSB			LSB
07h		Off	G	G	G	Uncompress various BIOS modules.
08h		G	Off	Off	Off	Verify password checksum.
08h		G	Off	Off	Off	Verify CMOS checksum.
07h		Off	G	G	G	Read microcode updates from BIOS ROM.
07h		Off	G	G	G		Initializing the processors.			Set up processor registers. Select least
							featured processor as the BSP.
0Bh	G		Off	G	G	Hook before the keyboard BAT command is issued.
0Ch	G		G	Off	Off		Keyboard Controller Test:			the keyboard controller input buffer is free.
							Next, issuing the BAT command to the keyboard controller.
							Init after keyboard test: the keyboard controller BAT command result
0Eh	G		G	G	Off		has been verified.		Next, performing any necessary initialization after
							the keyboard controller BAT command test.
							Write Command Byte 8042: the initialization after the keyboard
0Fh		G	G	G	G		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.
							Setup Interrupt Vectors: reading the 8042 input port and disabling
23h		Off	Off	A	G		the MEGAKEY Green PC feature next. Making the BIOS code
							segment writable and performing any necessary configuration before
							initializing the interrupt vectors.
							Before Vector: configuration is required before interrupt vector
24h		Off	G	R	Off		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.

continued

POST Error Codes, Messages and FRU to Failure Information 99