The following numeric codes appear on the System Board LEDs (in hex.)
to report the progress of the Power-On Diagnostics, or on the LEDs and
on the screen (in decimal) to report errors found by the Diagnostics.

Error Codes -- Power On Diagnostics
-----------------------------------

LEDs (hex)	Screen (dec)	Meaning
----------	------------	-----------------------------------
00h		00		Error in POS registers.
01H		01		Flag register failed.
02H		02		CPU register failed.
03H		03		ROM did not checksum.
04H		04		DMA controller failed.
05H		05		System Timer failed.
06H		06		Base 64K failed address test.  Can
				also mean no memory installed or
				improper memory configuration.
07H		07		Base 64K failed ram test.
08H		08		Interrupt controller failed.
09H		09		Hot interrupt occurred.
0AH		10		System timer doesn't interrupt.
0BH		11		CPU still in protected mode.
0CH		12		DMA Page registers failed.
0DH		13		Refresh is not occurring.
0EH		14		Keyboard Controller not responding.
0FH		15		Could not enter protected mode.
10H		16		GDT or IDT failed.
11H		17		LDT Register failed.
12H		18		Task Register failed.
13H		19		LSL instruction failed.
14H		20		LAR instruction failed.
15H		21		VERR/VERW failed.
16H		22		Keyboard Controller A20 failed.
17H		23		Exception failed / unexpected.
18H		24		Shutdown during memory test.
18H		25		Last used error code.
19H		26		Copyright checksum error.
1AH		27		Shutdown during memory sizing.
1BH		28		Chipset Initialization.

Power on Diagnostics Test Codes
-------------------------------

LEDs (hex)			Meaning
----------			-----------------------------------
50H				Initialize hardware.
51H				Initialize timer.
52H				DMA init.
53H				8259 init.
54H				Initialize Chipset.
55H				Set up BMS configuration.
56H				Entering Protected Mode for first time.
57H				Size memory chips.
58H				Configure memory chip interleave.
59H				Exiting Protected Mode for first time.
5AH				Determine System Board memory size.
5BH				Relocate Shadow RAM.
5CH				Configure EMS.
5DH				Set up Wait State configuration.
5EH				Re-test base 64K RAM.
5FH				Test Shadow RAM.
60H				CMOS test.
61H				Video test.
63H				Protected mode interrupt test.
64H				Test line a20.
65H				Test memory address lines.
66H				Memory test.
67H				Extended Memory test.
68H				Timer Interrupt test.
69H				RTC test.
6AH				Keyboard test.
6BH				80287 test.
6CH				RS232 test.
6DH				Parallel test.
6EH				Dual card test.
6FH				Floppy test.
70H				Fixed disk test.
71H				Keylock test.
72H				Pointing device test.


Power on Diagnostics General Information Codes
----------------------------------------------

LEDs (hex)			Meaning
----------			-----------------------------------
90H				RAM Setup.
91H				Calculate CPU Speed.
92H				Check configuration.
93H				BIOS initialization.
94H				POD Bootstrap.
95H				Reset ICs.
96H				System board POS.
97H				VGA Power-on Diagnostics and setup.
98H				Adapter POS.


Power on Diagnostics Exception Codes
------------------------------------

LEDs (hex)	Screen (dec)	Meaning
----------	------------	-----------------------------------
A0H		160		Exception 0 during POD.
A1H		161		Exception 1 during POD.
A2H		162		Exception 2 during POD.
A3H		163		Exception 3 during POD.
A4H		164		Exception 4 during POD.
A5H		165		Exception 5 during POD.
A6H		166		Exception 6 during POD.
A7H		167		Exception 7 during POD.
A8H		168		Exception 8 during POD.
A9H		169		Exception 9 during POD.
AAH		170		Exception A during POD.
ABH		171		Exception B during POD.
ACH		172		Exception C during POD.
ADH		173		Exception D during POD.


Non-Maskable Interrupt Error codes
----------------------------------

LEDs (hex)	Screen (dec)	Meaning
----------	------------	-----------------------------------
C0H		224		System board memory failure.
C1H		225		I/O Channel Check activated.
C2H		226		Watchdog Time out.
C3H		227		Bus Time out.