Intel user manual POST Code Error Messages, BPC-500-5820Users Manual

POST Code Error Messages

The following codes are not displayed on the screen. They can only be viewed on the LED display of a so called POST card. The codes are listened in the same order as the according functions are executed at PC startup. If you have access to a POST Card reader, you can watch the system perform each test by the value that's displayed. If the system hangs (if there's a problem) the last value displayed will give you a good idea where and what went wrong, or what's bad on the system board.

CODE	CHECK	DESCRIPTION OF CHECK
C0	Turn Off Chipset	OEM Specific-Cache control Cache
01	Processor Test 1	Processor Status (1FLAGS) Verification. Tests the
		following processor status flags:carry, zero, sign,
		overflow, The BIOS sets each flag, verifies they are
		set, then turns each flag off and verifies it is off.
02	Processor Test 2	Read/Write/Verify all CPU registers except SS, SP,
		and BP with data pattern FF and 00.
03	Initialize Chips	Disable NMI, PIE, AIE, UEI, SQWV Disable video,
		parity checking, DMA Reset math coprocessor
		Clear all page registers, CMOS shutdown byte
		Initialize timer 0, 1, and 2, including set EISA timer
		to a known state
		Initialize DMA controllers 0 and 1 Initialize interrupt
		controllers 0 and 1 Initialize EISA extended
		registers.
04	Test Memory	RAM must be periodically refreshed to
	Refresh Toggle	keep the memory from decaying. This function
		ensures that the memory refresh function is
		working properly.
05	Blank video	Keyboard controller initialization
	Initialize keyboard
06	Reserved
07	Test CMOS	Verifies CMOS is working correctly,
	Interface and	detects bad battery.
	Battery Status
BE	Chipset Default	Program chipset registers with power
	Initialization	on BIOS defaults.

C1	Memory presence	OEM Specific-Test to size on-board
	test	memory
C5	Early Shadow	OEM Specific-Early Shadow enable for fast boot.
C6	Cache presence	External cache size detection
	test
08	Setup low memory	Early chip set initialization
		Memory presence test
		OEM chip set routines
		Clear low 64K of memory
		Test first 64K memory.
09	Early Cache	Cyrix CPU initialization
	Initialization	Cache initialization
0A	Setup Interrupt	Initialize first 120 interrupt
	Vector Table	vectors with SPURIOUS_INT_HDLR and initialize
		INT 00h-1Fh according to INT_TBL
0B	Test CMOS RAM	Test CMOS RAM Checksum, if bad, or
	Checksum	insert key pressed, load defaults.
0C	Initialize	Detect type of keyboard controller
	keyboard	(optional)
		Set NUM_LOCK status.
0D	Initialize Video	Detect CPU clock.
	Interface	Read CMOS location 14h to find out type of video
		in use.
		Detect and Initialize Video Adapter.
0E	Test Video	Test video memory, write sign-on
	Memory	message to screen.
		Setup shadow RAM - Enable shadow according to
		Setup.
0F	Test DMA	BIOS checksum test.
	Controller 0	Keyboard detect and initialization

10Test DMA Controller 1

BPC-500-5820 User's Manual 27