Phoenix BIOS Post Codes

Phoenix BIOS Text Error Messages
Phoenix BIOS Post Procedures
Phoenix XT 2.52 PnP BIOS Post Codes
Phoenix BIOS Plus or v1.0 BIOS Post Codes
Phoenix UMC chipset PCI BIOS Post Codes
Phoenix PCI BIOS Post Codes
Phoenix ISA/EISA/MCA v3.07 BIOS Post Codes
Phoenix 4.0 BIOS Post Codes
Phoenix 4.0 Release 6.0 BIOS Post Codes

Phoenix BIOS Text Error Messages:

Diskette drive A error	Drive A: is present but fails the POST diskette tests. Check that the drive is defined with the proper diskette type in Setup and that the disk is installed correctly
Extended RAM failed at offset: nnn	Extended memory not working or not configured properly at offset: nnn
Failing Bits: nnnn	The hexadecimal number nnnn is a map of the bits at the RAM address that failed the memory test. Each 1 in the map indicates a failed bit
Fixed Disk 0 Failure	Fixed disk is not working or not configured properly. Check to see if fixed disk is installed properly. Run Setup to be sure the fixed disk type is correctly identified
Fixed Disk 1 Failure	Fixed disk is not working or not configured properly. Check to see if fixed disk is installed properly. Run Setup to be sure the fixed disk type is correctly identified
Fixed Disk Controller Failure	Fixed disk is not working or not configured properly. Check to see if fixed disk is installed properly. Run Setup to be sure the fixed disk type is correctly identified
Incorrect Drive A: type - run Setup	Type of diskette for drive A: not correctly identified in Setup
Invalid NVRAM media type	Problem with NVRAM (CMOS) access
Keyboard controller error	The keyboard controller failed test. Try replacing the keyboard
Keyboard error	Keyboard not working
Keyboard error nn	BIOS discovered a stuck key and displays the scan code nn for the stuck key
Keyboard locked - Unlock key switch	Unlock the system to proceed
Monitor type does not match CMOS - Run Setup	Monitor type not correctly identified in Setup
Operating system not found	Operating system cannot be located on either A: or C:. Enter Setup and see if fixed disk and drive A: are properly identified
Parity Check 1	Parity error found in the system bus. BIOS attempts to locate the address and display it on screen. If it cannot locate the address, it displays ???
Parity Check 2	Parity error found in the I/O bus. BIOS attempts to locate the address and display it on screen. If it cannot locate the address, it displays ???
Press <F1> to resume, <F2> to Setup	Displayed after any recoverable error message. Press F1 to start the boot process or F2 to enter Setup and change any settings
Real-time clock error	Real-time clock fails BIOS test. Might require motherboard repair
Shadow RAM failed at offset: nnnn	Shadow RAM failed at offset nnnn of the 64KB block at which the error was detected
System battery is dead - Replace and run Setup	The CMOS clock battery indicator shows the battery is dead. Replace the battery and run Setup to reconfigure the system
System cache error - Cache disabled	RAM cache failed the BIOS test. BIOS disabled the cache
System CMOS checksum bad - run Setup	System CMOS RAM has been corrupted or modified incorrectly. Perhaps by an application program that changes data stored in CMOS. Run Setup and reconfigure the system either by getting the default values or making your own selections
System RAM failed at offset: nnnn	System RAM failed at offset nnnn of the 64KB block at which the error was detected
System timer error	The timer test failed. Requires repair of system motherboard

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Phoenix BIOS Post Procedures:

CPU	Check internal operations i.e. ALE/IRQ status, Request, LA and memory read/write
CMOS RAM	Test with walking bit pattern
ROM BIOS	Perform checksum on ROM BIOS where all bits are added and compared to a factory set total
PIT	Check to ensure interrupt requests are properly executed
DMA	Check DMA from CPU to memory without BIOS. Also check page registers
Base 64K	Check first 4K block
Serial and Parallel Ports	I/O data areas for any devices found are assigned but are not tested
PIC	Check that proper interrupt request levels are addressed
Keyboard Controller	Check 8240 for proper operation, including scan code response and Gate A20 which allows CPU operation in protected mode
CMOS	Check data within CMOS and compare to BIOS information. Failure of the extended area is often due to wrong data setup. Constant failure after resetting CMOS is either battery CMOS chip or RTC
Video Controller	Test and initialize controller and ROM on the video adapter
RTC	Check to ensure proper frequencies are on proper lines for the Video Color CPU and DMA frequency. Check RTC and PIT or the system crystal if a failure occurs
CPU	Return from protected mode. CPU is put into protected mode and returns to the POST at the point indicated by the CMOS ROM data area byte 0F. Failure here is normally due to the CPU, keyboard controller, CMOS chip or an address line
PIC	Test counter 2
NMI	Check for non maskable interrupt request vector for active status. Failure is normally due to the CMOS but could also be the BIOS IRQ or CPU chips
Keyboard	Check for NumLock and/or Caps and Shift keys
Mouse	Initialize through the keyboard controller. This is only done if a mouse is present and it is initialized in this way
RAM Above 64K	Test in 64KB blocks with a walking bit pattern and parity enabled
Fixed and Floppy Controllers	Test for proper response to BIOS calls
Shadow RAM Areas	Look in CMOS for settings on which adapter or system ROM's are to be shadowed
Option ROM	Look for ROM signatures of 55AA in extended memory then initialize the ROM and halt testing while internal checks are carried out
External Cache	Check controller chip for external cache
CPU Internal Cache	The CPU's internal cache is tested
Hardware Interrupts	Initialize and test video, floppy, hard I/O adapters, serial and parallel ports
Cassette	Test internal or external cassette drives
Boot Code Errors	Errors occurring after this point are normally a corrupt boot record

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Phoenix XT 2.52 PnP BIOS Post Codes:

01	Test 8253 timer
02	First 64K RAM failed
03	First 1K parity check failed
04	Initialize 8259 interrupt controller
05	Second 1K RAM test, BIOS data area, failed

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Phoenix BIOS Plus or v1.0 BIOS Post Codes:

01	CPU register test in progress
02	CMOS read/write failure
03	ROM BIOS checksum failure
04	Programmable interval timer failure
05	DMA initialization failure
06	DMA page register read/write failure
08	RAM refresh verification failure
09	First 64K RAM test in progress
0A	First 64K RAM chip or data line failure multi-bit
0B	First 64K RAM odd/even parity logic failure
0C	Address line failure in first 64K RAM
0D	Parity failure in first 64K RAM
10	Bit 0 first 64K RAM failure
11	Bit 1 first 64K RAM failure
12	Bit 2 first 64K RAM failure
13	Bit 3 first 64K RAM failure
14	Bit 4 first 64K RAM failure
15	Bit 5 first 64K RAM failure
16	Bit 6 first 64K RAM failure
17	Bit 7 first 64K RAM failure
18	Bit 8 first 64K RAM failure
19	Bit 9 first 64K RAM failure
1A	Bit a(10) first 64K RAM failure
1B	Bit B(11) first 64K RAM failure
1C	Bit C(12) first 64K RAM failure
1D	Bit D(13) first 64K RAM failure
1E	Bit E(14) first 64K RAM failure
1F	Bit F(15) first 64K RAM failure
20	Slave DMA register failure
21	Master DMA register failure
22	Master interrupt mask register failure
23	Slave interrupt mask register failure
25	Interrupt vector loading in progress
27	8042 keyboard controller test failure
28	CMOS power failure/checksum calculation in progress
29	CMOS configuration validation in progress
2B	Screen memory test failure
2C	Screen initialization failure
2D	Screen retrace test failure
2E	Search for video ROM in progress
30	Screen believed running with video ROM
31	Mono monitor believed operational
32	Color monitor (40 columns) believed operational
33	Color monitor (80 columns) believed operational
34	Timer tick interrupt in progress or failed (non-fatal)
35	Shutdown failure (non-fatal)
36	Gate A20 failure (non-fatal)
37	Unexpected interrupt in protected mode (non-fatal)
38	Memory high address line failure at 01000-0A000 (non-fatal)
39	Memory high address line failure at 100000-FFFFFF (non-fatal)
3A	Timer chip counter 2 failed (non-fatal)
3B	Time of day clock stopped
3C	Serial port test
3D	Parallel port test
41	System board select bad
42	Extended CMOS RAM bad

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Phoenix UMC chipset PCI BIOS Post Codes:

02	Verify real mode operation
04	Get CPU type
06	Initialize system hardware
08	Initialize chipset registers with initial POST values
09	Set in POST flag
0A	Initialize CPU registers
0C	Initialize cache to initial POST values
0E	Initialize I/O
10	Initialize power management
11	Load alternate registers with initial POST values
12	Jump to user patch 0
14	Initialize keyboard controller
16	BIOS ROM checksum
18	8254 programmable interrupt timer initialization
1A	8237 DMA controller initialization
1C	Reset 8259 programmable interrupt controller
20	Test DRAM refresh
22	Test 8742 keyboard controller
24	Set ES segment register to 4GB
26	Enable address line A20
28	Autosize DRAM
2A	Clear 512K base memory
2C	Test 512K base address lines
2E	Test 512K base memory
30	Test base address memory
32	Test CPU bus clock frequency
34	Test CMOS RAM
35	Test chipset register initialize
36	Test check resume
37	Reinitialize the chipset
38	Shadow system BIOS ROM
39	Reinitialize the cache
3A	Autosize the cache
3C	Configure advanced chipset registers
3D	Load alternate registers with CMOS values
3E	Read hardware configuration from keyboard controller
40	Set initial CPU speed
42	Initialize interrupt vectors
44	Initialize BIOS interrupts
46	Check ROM copyright notice
47	Initialize manager for PCI options ROM's
48	Check video configuration against CMOS
49	Initialize PCI bus and devices
4A	Initialize all video adapters
4C	Shadow video BIOS ROM
4E	Display copyright notice
50	Display CPU type and speed
52	Test keyboard
54	Set key click if enabled
56	Enable keyboard
58	Test for unexpected interrupts
5A	Display prompt "Press F2 to Enter Setup"
5C	Test RAM between 512K and 640K
5E	Test base memory
60	Test expanded memory
62	Test extended memory address lines
64	Jump to user patch 1
66	Configure advanced cache registers
68	Enable external and CPU registers
69	Set up power management
6A	Display external cache size
6C	Display shadow message
6E	Display non-disposable segments
70	Display error messages
72	Check for configuration messages
74	Test real time clock
76	Check for keyboard errors
7A	Enable keylock
7C	Setup hardware interrupt vectors
7E	Test coprocessor if present
80	Disable onboard I/O ports
82	Detect and install external RS232 ports
84	Detect and install external parallel ports
86	Reinitialize onboard I/O ports
88	Initialize BIOS data areas
8A	Initialize extended BIOS data area
8C	Initialize floppy drive controller
8E	Hard disk autotype configuration
90	Initialize hard disk controller
91	Initialize local bus hard disk controller
92	Jump to user patch 2
94	Disable A20 address lines
96	Clear huge ES segment register
98	Search for option ROM's
9A	Shadow options ROM's
9C	Setup power management
9E	Enable hardware interrupts
A0	Set time of day
A2	Check key lock
A4	Initialize typematic rate
A8	Erase F2 prompt
AA	Scan for F2 keystroke
AC	Enter setup
AE	Clear in-POST flag
B0	Check for errors
B2	POST done
B4	One beep
B6	Check password (optional)
B8	Clear global descriptor table
BC	Clear parity checkers
BE	Clear screen (optional)
C0	Try to boot with interrupt 19
D0	Interrupt handler error
D2	Unknown interrupt error
D4	Pending interrupt error
D6	Initialize option ROM error
D8	Shutdown error
DA	Extended block move
DC	Shutdown 10 error

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Phoenix PCI BIOS Post Codes:

02	If the CPU is in protected mode, turn on gate A20 and pulse the reset line. Forces a shutdown 0.
04	On cold boot, save the CPU type information value in the CMOS
06	Reset DMA controllers; Disable video; Clear pending interrupts from real time clock; Setup port B register
08	Initialize chipset control registers to power on defaults
0A	Set a bit in the CMOS that indicates POST; used to determine if the current configuration causes the BIOS to hang. If true, default BIOS values set on next POST
0C	Initialize I/O module control registers
0E	External CPU caches initialized; Cache registers set to default values
10/12/14	Verify response from 8742 keyboard controller
16	Verify BIOS ROM checksums to zero
18	Initialize all three 8254 programmable interrupt timers
1A	Initialize DMA command register; Initialize 8 DMA channels
1C	Initialize 8259 programmable interrupt controller; ICW4 needed; Cascade and edge triggered mode
20	Test DRAM refresh by polling refresh bit in post B
22	Test 8742 keyboard controller; Self test send to keyboard controller and awaiting results; Read the switch inputs from the 8742 keyboard controller and write the keyboard controller command byte
24	Set ES segment register to 4GB
26	Enable address line A20
28	Autosize DRAM
2A	Clear first 64K of RAM
2C	Test RAM address lines
2E	Test first 64K bank of memory by checking chip address line test and RAM test
30/32	Find true CPU speed (MHz)
34	Clear CMOS diagnostic byte (register E); Check real time clock and verify battery; Checksum the CMOS and verify for corruption
36/38/3A	External cache is autosized and its configuration for enabling later in POST
3C	Configure advanced cache features; Configure external cache's configurable parameters
3E	Read hardware configuration from keyboard controller
40	Set system power-on speed to the rate determined by the CMOS; If the CMOS is invalid, use a lower speed
42	Initialize interrupt vectors 0-77h to the BIOS general interrupt handler
44	Initialize interrupt vectors 0-20h to proper values from the BIOS interrupt tables
46	Check copyright message checksum
48	Check video configuration
4A	Initialize both monochrome and color graphics video adapters
4C/4E	Display copyright message
50	Display CPU type and speed
52	Test for the self-test code if a cold start; Keyboard performs a self-test and sends and AA if successful
54	Initialize keystroke clicker during POST
56	Enable keyboard
58	Test for unexpected interrupts; Check STI for hot interrupts; Test NMI for unexpected interrupts; Enable parity checkers and read from memory checking for unexpected interrupt
5A	Display prompt "Press F2 to Enter Setup"
5C	Determine and test the amount of memory available; Save total size to BIOS variable called bdaMemorySize
5E	Perform address of base memory
60	Determine and test the amount of extended memory available; Save the total size in the CMOS at CMOSExtended
62	Perform and address line test on A0 to the amount of memory available
68	External and CPU caches, if present, are enabled
6A	Display cache size on screen if non-zero
6C	Display BIOS shadow status
6E	Display the starting offset of the non-disposable section of the BIOS
70	Check flags in CMOS and in the BIOS data area to see if any errors have been detected during the POST
72	Check status bits for configuration errors
74	Test real time clock if the battery has lost power
76	Check status bits for keyboard errors; Errors are displayed
78	Check for stuck keys on the keyboard; Errors are displayed
7A	Enable keylock
7C	Setup hardware interrupt vectors
7E	Test coprocessor if present
80/82	Detect and install RS232 ports
84	Detect and install parallel ports
86/88	Initialize timeouts/key buffer/soft reset flags
8A	Initialize extended BIOS data area and initialize the mouse
8C	Initialize the floppy disks and display error message if failure was detected
8E	Hard disk autotype detection
90	If the CMOS RAM is valid and intact and fixed disks are defined, call the fixed disk initialization routine to initialize the fixed disk system and take over the appropriate interrupt vectors
92/94	Disable gate A20 address line
96/98	Scan for ROM BIOS extensions
9E	Enable hardware interrupts
A0	Set time of day
A2	Setup numlock indicator
A4	Initialize typematic rate
A6	Initialize hard disk autoparking
A8	Erase F2 prompt
AA	Scan for F2 keystroke
AC	Check to see if SETUP should executed
AE	Clear ConfigFailedBit and InPostBit in CMOS
B0	Check for POST errors
B2	Set/clear status bits to reflect POST complete
B4	One beep
B6	Check for password before boot
B8	Clear global descriptor table
BA	Initialize the screen saver
BC	Clear parity error latch
BE	Clear screen
C0	Try to boot with interrupt 19
D0/D2	If an interrupt occurs before interrupts vectors have been initialized, interrupt handler will check if 8259 programmable interrupt timer caused the interrupt and which one; If error is unknown, InterruptFlag will be FF, otherwise, it will hold the IRQ number that occurred
D4	Clear pending timer and keyboard interrupts and transfer control to the double word address located at RomCheck
D6/D8/DA	Return from extended block move

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Phoenix ISA/EISA/MCA v3.07 BIOS Post Codes:

01	CPU register test in progress
02	CMOS read/write failure
03	ROM BIOS checksum failure
04	Programmable interval timer failure
05	DMA initialization failure
06	DMA page register write/read failure
08	RAM refresh verification failure
09	First 64K RAM test in progress
0A	First 64K RAM chip or data line failure multi-bit
0B	First 64K RAM odd/even logic failure
0C	Address line failure in first 64K RAM
0D	Parity failure in first 64K RAM
0E	Fail-safe timer failure
0F	Software NMI post failure
10	Bit 0 first 64K RAM failure
11	Bit 1 first 64K RAM failure
12	Bit 2 first 64K RAM failure
13	Bit 3 first 64K RAM failure
14	Bit 4 first 64K RAM failure
15	Bit 5 first 64K RAM failure
16	Bit 6 first 64K RAM failure
17	Bit 7 first 64K RAM failure
18	Bit 8 first 64K RAM failure
19	Bit 9 first 64K RAM failure
1A	Bit A first 64K RAM failure
1B	Bit B first 64K RAM failure
1C	Bit C first 64K RAM failure
1D	Bit D first 64K RAM failure
1E	Bit E first 64K RAM failure
1F	Bit F first 64K RAM failure
20	Slave DMA register failure
21	Master DMA register failure
22	Master interrupt mask register failure
23	Slave interrupt mask register failure
25	Interrupt vector loading in progress
27	Keyboard controller test failure
28	CMOS power failure; checksum calculation in progress
29	CMOS RAM configuration validation in progress
2B	Screen memory test failure
2C	Screen initialization failure
2D	Screen retrace test failure
2E	Search for video ROM in progress
30	Screen believed running with video ROM
31	Mono monitor believed operational
32	Color monitor (40 columns) believed operational
33	Color monitor ( 80 columns) believed operational
34	No time tick
35	Shutdown test in progress or failure
36	Gate A20 failure
37	Unexpected interrupt in protected mode
38	Memory high address line failure at 01000-0A000; RAM test in progress or address failure >FFFh
39	Memory high address line failure at 100000-FFFFFF
3A	Interval timer channel 2 test or failure
3B	Time of day clock test or failure
3C	Serial port test or failure
3D	Parallel port test or failure
3E	Math coprocessor test
3F	Cache test (Dell)
41	System board select bad (Micro Channel only)
42	Extended CMOS RAM bad (Micro Channel only)

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Phoenix 4.0 BIOS Post Codes:

02	Verify real mode
04	Get CPU type
06	Initialize system hardware
08	Initialize chipset registers with initial POST values
09	Set in POST flag
0A	Initialize CPU registers
0C	Initialize cache to initial POST values
0E	Initialize I/O
10	Initialize power management
11	Load alternate registers with initial POST values
12	Jump to UserPatch0
14	Initialize keyboard controller
16	BIOS ROM checksum
18	8254 programmable interrupt timer initialization
1A	8237 DMA controller initialization
1C	Reset 8254 programmable interrupt timer
20	Test DRAM refresh
22	Test 8742 keyboard controller
24	Set ES segment register to 4GB
28	Autosize DRAM
2A	Clear 512K base RAM
2C	Test 512K base address lines
2E	Test 512K base memory
32	Test CPU bus-clock frequency
37	Reinitialize the chipset
38	Shadow system BIOS ROM
39	Reinitialize the cache
3A	Autosize cache
3C	Configure advanced chipset registers
3D	Load alternate registers with CMOS values
40	Set initial CPU speed
42	Initialize interrupt vectors
44	Initialize BIOS interrupts
46	Check ROM copyright notice
48	Check video configuration against CMOS
49	Initialize PCI bus and devices
4A	Initialize all video adapters in system
4C	Shadow video BIOS ROM
4E	Display copyright notice
50	Display CPU type and speed
52	Test keyboard
54	Set key click if enabled
56	Enable keyboard
58	Test for unexpected interrupts
5A	Display prompt "Press F2 to Enter Setup"
5C	Test RAM between 512K and 640K
60	Test expanded memory
62	Test extended memory address lines
64	Jump to UserPatch1
66	Configure advanced cache registers
68	Enable external and CPU caches
6A	Display external cache size
6C	Display shadow message
6E	Display non-disposable segments
70	Display error messages
72	Check for configuration errors
74	Test real time clock
76	Check for keyboard errors
7C	Setup hardware interrupts vectors
7E	Test coprocessor if present
80	Disable onboard I/O ports
82	Detect and install external RS232 ports
84	Detect and install external parallel ports
86	Re-initialize on-board I/O ports
88	Initialize BIOS data area
8A	Initialize extended BIOS data area
8C	Initialize floppy controller
90	Initialize hard disk controller
91	Initialize local bus hard disk controller
92	Jump to UserPatch2
94	Disable A20 address line
96	Clear huge ES segment register
98	Search for option ROM's
9A	Shadow option ROM's
9C	Setup power management
9E	Enable hardware interrupts
A0	Set time of day
A2	Check key lock
A8	Erase F2 prompt
AA	Scan for F2 keystroke
AC	Enter setup
AE	Clear in-POST flag
B0	Check for errors
B2	POST done; prepare to boot operating system
B4	One beep
B6	Check password (optional)
B8	clear global descriptor table
BC	Clear parity checkers
BE	Clear screen (optional)
BF	Check virus and backup reminders
C0	Try to boot interrupt 19
D0	Interrupt handler error
D2	Unknown interrupt error
D4	Pending interrupt error
D6	Initialize option ROM error
D8	Shutdown error
DA	Extended block move
DC	Shutdown 10 error
E2	Initialize the chipset
E3	Initialize refresh counter
E4	Check for forced flash
E5	Check HW status of ROM
E6	BIOS ROM is ok
E7	Do a complete RAM test
E8	Do OEM initialization
E9	Initialize interrupt controller
EA	Read in bootstrap code
EB	Initialize all vectors
EC	Boot the flash program
ED	Initialize the boot device
EE	Boot code was read ok

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Phoenix 4.0 Release 6.0 BIOS Post Codes:

02	Verify real mode
03	Disable non-maskable interrupt (NMI)
04	Get CPU type
06	Initialize system hardware
07	Disable shadow and execute code from the ROM
08	Initialize chipset with initial POST values
09	Set IN POST flag
0A	Initialize CPU registers
0B	Enable CPU cache
0C	Initialize caches to initial POST values
0E	Initialize I/O component
0F	Initialize the local bus IDE
10	initialize power management
11	Load alternate registers with initial POST values
12	Restore CPU control word during warm boot
13	Initialize PCI bus mastering devices
14	Initialize keyboard controller
16	BIOS ROM checksum
17	Initialize cache before memory autosize
18	8254 programmable interrupt timer initialization
1A	8237 DMA controller initialization
1C	Reset programmable interrupt controller
20	Test DRAM refresh
22	Test 8742 keyboard controller
24	Set ES segment register to 4GB
26	Enable gate A20 line
28	Autosize DRAM
29	Initialize POST memory manager
2A	Clear 512KB base RAM
2C	RAM failure on address line xxxx
2E	RAM failure on data bits xxxx of low byte of memory bus
2F	Enable cache before system BIOS shadow
30	RAM failure on data bits xxxx of high byte of memory bus
32	Test CPU bus clock frequency
33	Initialize Phoenix Dispatch Manager
36	Warm start shut down
38	Shadow system BIOS ROM
3A	Autosize cache
3C	Advanced configuration of chipset registers
3D	Load alternate registers with CMOS values
41	Initialize extended memory for RomPilot
42	Initialize interrupt vectors
45	POST device initialization
46	Check ROM copyright notice
47	Initialize I20 support
48	Check video configuration against CMOS
49	Initialize PCI bus and devices
4A	Initialize all video adapters in system
4B	QuietBoot start (optional)
4C	Shadow video BIOS ROM
4E	Display BIOS copyright notice
4F	Initialize MultiBoot
50	Display CPU type and speed
51	Initialize EISA board
52	Test keyboard
54	Set key click if enabled
55	Enable USB devices
58	Test for unexpected interrupts
59	Initialize POST display service
5A	Display prompt "Press F2 to enter SETUP"
5B	Disable CPU cache
5C	Test RAM between 512KB and 640KB
60	Test extended memory
62	Test extended memory address lines
64	Jump to UserPatch1
66	Configure advanced cache registers
67	Initialize Multi Processor APIC
68	Enable external and CPU caches
69	Setup system management mode (SMM) area
6A	Display external L2 cache size
6B	Load custom defaults (optional)
6C	Display shadow area message
6E	Display possible high address for UMB recovery
70	Display error messages
72	Check for configuration errors
76	Check for keyboard errors
7C	Set up hardware interrupt vectors
7D	Initialize Intelligent System Monitoring
7E	Initialize coprocessor if present
80	Disable onboard super I/O ports and IRQ's
81	Late POST device initialization
82	Detect and install external RS232 ports
83	Configure non-MCD IDE controllers
84	Detect and install external parallel ports
85	Initialize PC compatible PnP ISA devices
86	Reinitialize onboard I/O ports
87	Configure motherboard configurable devices (optional)
88	Initialize BIOS data area
89	Enable non-maskable interrupts (NMI's)
8A	Initialize extended BIOS data area
8B	Test and initialize PS/2 mouse
8C	Initialize floppy controller
8F	Determine number of ATA drives (optional)
90	Initialize hard disk controllers
91	Initialize local bus hard disk controllers
92	Jump to UserPatch2
93	Build MPTABLE for multi processor boards
95	Install CD ROM for boot
96	Clear huge ES segment register
97	Fixup multi processor table
98	Search for option ROM's
99	Check for SMART drive (optional)
9A	Shadow option ROM's
9C	Set up power management
9D	Initialize security engine (optional)
9E	Enable hardware interrupts
9F	Determine number of ATA and SCSI drives
A0	Set time of day
A2	Check key lock
A4	Initialize typematic rate
A8	Erase F2 prompt
AA	Scan for F2 key stroke
AC	Enter setup
AE	Clear boot flag
B0	Check for errors
B1	Inform RomPilot about the end of POST
B2	POST done - prepare to boot operating system
B4	One short beep
B5	Terminate QuietBoot (optional)
B6	Check password
B7	Initialize ACPI BIOS
B9	Prepare boot
BA	Initialize DMI parameters
BB	Initialize PnP option ROM's
BC	Clear parity checkers
BD	Display multiboot menu
BE	Clear screen
BF	Check virus and backup reminders
C0	Try to boot with interrupt 19
C1	Initialize POST Error Manager (PEM)
C2	Initialize error logging
C3	Initialize error display function
C4	Initialize system error handler
C5	PnP dual CMOS (optional)
C6	Initialize notebook docking (optional)
C7	Initialize notebook docking late
C8	Force check (optional)
C9	Extended checksum (optional)
CA	Redirect Int 15h to enable remote keyboard
CB	Redirect Int 13 to Memory Technologies Devices such as ROM, RAM, PCMCIA, and serial disk
CC	Redirect Int 10h to enable remote serial video
CD	Re-map I/O and memory for PCMCIA
CE	Initialize digitizer and dispaly message
D2	Unknown interrupt
	The following are for boot block in Flash ROM
E0	Initialize the chipset
E1	Initialize the bridge
E2	Initialize the CPU
E3	Initialize the system timer
E4	Initialize system I/O
E5	Check force recovery boot
E6	Checksum BIOS ROM
E7	Go to BIOS
E8	Set Huge Segment
E9	Initialize Multi Processor
EA	Initialize OEM special code
EB	initialize PIC and DMA
EC	Initialize Memory type
ED	Initialize Memory size
EE	Shadow Boot Block
EF	System memory test
F0	Initialize interrupt vectors
F1	Initialize Run Time Clock
F2	Initialize video
F3	Initialize System Management Menager
F4	Output one beep
F5	Clear Huge Segement
F6	Boot to mini DOS
F7	Boot to Full DOS

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All information has been gathered with permission of the respective BIOS providers. Although Bios Central has used reasonable effort to ensure accuracy we are unable to verify all codes posted. Use at your own risk. Bios Central, or any person associated with Bios Central takes no responsibility for any dmage resulting from the use of this information.