Below are the AMI Beep codes that can occur. However, because of the wide variety of different computer manufacturers with this BIOS, the beep codes may vary.
- AMI BIOS Text Error Messages
- AMIT BIOS Post Codes (Prior to April 1990)
- AMI BIOS Post Codes (After April 1990)
- AMI 2.2 BIOS Post Codes
- AMI Plus BIOS Post Codes
- AMI Color BIOS Post Codes
- AMI Win BIOS Post Codes
- AMI Ez-Flex BIOS Post Codes
AMI BIOS Post Procedures – For BIOS’s of Feb 1991
| NMI Disable | NMI interrupt line to the CPU is disabled by setting bit 7 I?O port 70h (CMOS) |
| Power On Delay | Once the keyboard controller gets power, it sets the hard and soft reset bits. Check the keyboard controller or clock generator if a failure occurs |
| Initialize Chipsets | Check the BIOS, CLOCK and chipsets |
| Reset Determination | The BIOS reads the bits in the keyboard controller to see if a hard or soft reset is required (a soft reset will not test memory above 64K). Failure could be the BIOS or keyboard controller |
| ROM BIOS Checksum | The BIOS performs a checksum on itself and adds a preset factory value that should make it equal to 00. If a failure occurs, check the BIOS chips |
| Keyboard Test | A command is sent to the 8042 keyboard controller which performs a test and sets a buffer space for commands. After the buffer is defined the BIOS sends a command byte, writes data to the buffer, checks the high order bits of the internal keyboard controller and issues a No Operation (NOP) command |
| CMOS | Shutdown byte in CMOS RAM offset 0F is tested, the BIOS checksum calculated and diagnostic byte 0E updated before the CMOS RAM area is initialized and updated for date and time. Check the RTC and CMOS chip or battery if a failure occurs |
| DMA (8237) and PIC (8259) Disable | The DMA and Programmable Interrupt Controller are disabled before the POST proceeds and further. Check the 8237 or 8259 chips if a failure occurs |
| Video Disable | The video controller is disabled and port B initialized. Check the video adapter if a failure occurs |
| Chipset Initialized and Memory Detected | Memory addressed in 64K blocks. Failure would be in the chipset. If all memory is not seen, failure could be in a chip in the block after the last one seen |
| PIT Test | The timing functions of the 8254 Programmable Interrupt Timer are tested. The PIT and RTC chips normally cause errors here |
| Memory Refresh | PIT’s ability to refresh memory is tested. If an XT, DMA controller #1 handles this. Failure is normally the PIT (8254) in AT’s or the 8237, DMA #1, in XT’s |
| Address Line | Test the address lines in the first 64K of RAM. If a failure occurs, an address line may be the problem |
| Base 64K | Data patterns are written to the first 64K of RAM, unless there is a bad RAM chip in which case you will get a failure |
| Chipset Initialization | The PIT, PIC and DMA controllers are initialized |
| Set Interrupt Table | Interrupt vector table used by PIC is installed in low memory, the first 2K |
| 8042 Keyboard Controller Check | The BIOS reads the buffer area in the keyboard controller I/O port 60. Failure here is normally the keyboard controller |
| Video Tests | The type of video adapter is checked for, then a series of tests are performed on the adapter and monitor |
| BIOS Data Area | The vector table is checked for proper operation and video memory verified before protected mode tests are entered into. This is done so that any errors found are displayed on the monitor |
| Protected Mode Tests | Perform reads and writes to all memory locations below 1MB. Failure at this point indicate a bad RAM chip, the 8042 Keyboard Controller or a data line |
| DMA Chips | The DMA registers are tested using a data pattern |
| Final Initialization | these differ with each version. Typically, the floppy and hard drives are tested and initialized and a check is made for serial and parallel devices. The information gathered is then compared against the contents of the CMOS and you will see the results of any failures on the monitor |
| BOOT | The BIOS hands over control to the Int 19 bootloader. This is where you would see error messages such as non-system disk |
AMI BIOS Text Error Messages
| Message | Explanation |
| Bad PnP Serial ID Checksum | The Serial ID checksum of a PnP card is invalid |
| Floppy Disk Controller Resource Conflict | The floppy drive controller had requested a resource that is already in use |
| NVRAM Checksum Error – NVRAM Cleared | The extended system configuration data (ESCD) was reinitialized because of an NVRAM checksum error. Clear CMOS and ESCD RAM and reboot |
| NVRAM Cleared By Jumper | The Clear CMOS jumper has been moved to the Clear position. CMOS RAM and ESCD have been cleared |
| NVRAM Data Invalid – NVRAM Cleared | Invalid data found in the ESCD, which might mean that you have changed devices in the system. When this message is displayed, the BIOS has already rewritten the ESCD with current configuration data |
| Parallel Port Resource Conflict | The parallel port requested a resource that is already in use |
| PCI Error Log is Full | More than 15 PCI conflict errors have been detected and no additional PCI errors can be logged |
| PCI I/O Port Conflict | Two devices requested the same I/O address, resulting in a conflict |
| PCI IRQ Conflict | Two devices requested the same IRQ, resulting in a conflict |
| PCI Memory Conflict | Two devices requested the same memory resource, resulting in a conflict |
| Primary Boot Device Not Found | Two designated primary boot device (hard disk, floppy disk drive, CD-ROM drive) could not be found |
| Primary IDE Controller Resource Conflict | The primary IDE controller has requested a resource that is already in use |
| Primary Input Device Not Found | The designated primary input device (keyboard, mouse, or other device if input is redirected) could not be found |
| Secondary IDE Controller Resource Conflict | The secondary IDE controller has requested a resource that is already in use |
| Serial Port 1 Resource Conflict | Serial port 1 has requested a resource that is already in use |
| Serial Port 2 Resource Conflict | Serial port 2 has requested a resource that is already in use |
| Static Device Resource Conflict | A card that is not Plug-and-Play ISA has requested a resource that is already in use |
| System Board Device Resource Conflict | A card that is not Plug-and-Play ISA has requested a resource that is already in use |
| A20 Error | Gate A20 on the keyboard controller is not working |
| Address line Short | Error in the address decoding circuitry on the motherboard |
| CMOS Battery State Low | The battery power is low; replace the battery |
| CMOS Checksum Invalid | After CMOS RAM values are saved, a checksum value is generated for error checking. The previous value is different from the current value |
| Run Setup | CMOS system options not set. The values stored in CMOS RAM are either corrupt or nonexistent. Run Setup |
| CMOS Display Type Mismatch | The video type in CMOS RAM does not match the type detected by the BIOS. Run Setup |
| CMOS Memory Size Mismatch | The amount of memory on the motherboard is different from the amount indicated in CMOS RAM. Run Setup |
| CMOS Time and Date Not Set | run Setup to set the time and date in the CMOS RAM |
| Diskette Boot Failure | The boot disk in drive A: is corrupt. It cannot be used to boot the system. Use another boot disk and follow the screen instructions |
| DMA Error | Error in the DMA controller |
| DMA #1 Error | Error in the first DMA controller |
| DMA #2 Error | Error in the second DMA controller |
| FDD Controller Failure | The BIOS cannot communicate with the floppy disk drive controller. Check all appropriate cables and connections |
| HDD Controller Failure | The BIOS cannot communicate with the hard disk drive controller. Check all appropriate cables and connections |
| Insert Bootable Media | The BIOS cannot find a bootable medium. Insert a bootable floppy disk or CD-ROM |
| INTR #1 Error | Interrupt controller 1 failed POST |
| INTR #2 Error | Interrupt controller 2 failed POST |
| Invalid Boot Diskette | The BIOS can read the disk in floppy drive A:, but cannot boot the system from it. Use another boot disk |
| KB/Interface Error | There is an error in the keyboard connector |
| Keyboard Error | There is a timing problem with the keyboard |
| Keyboard Stuck Key Detected | A stuck keyboard key was detected |
| Off Board Parity Error | Parity error in memory installed in an expansion slot. The format is: OFF BOARD PARITY ERROR ADDR (HEX) = (XXXX), where XXXX is the hex address where the error occurred |
| On Board Parity Error | Parity error in memory installed on the motherboard. The format is: ON BOARD PARITY ERROR ADDR (HEX) = (XXXX), where XXXX is the hex address where the error occurred |
| Parity Error | Parity error in system memory at an unknown address |
| System halted | An error caused the computer to halt |
| Timer Channel 2 Error | There is an error in counter/timer 2 |
| Uncorrectable ECC Error | An uncorrectable ECC memory error was detected |
| Undetermined NMI | An undetermined NMI was detected |
| Memory parity Error at xxxxx | Memory failed. If the memory location can be determined, it is displayed as xxxxx. If not, the message is Memory Parity Error ????. |
| I/O Card Parity Error at xxxxx | An expansion card failed. If the address can be determined, it is displayed as xxxxx. if not, the message is I/O Card Parity error ???? |
| DMA Bus Timeout | A device has driven the bus signal for more than 7.8 microseconds |
AMIT BIOS Post Codes (Prior to April 1990)
| 01 | NMI is disabled and the i286 register test is about to start |
| 02 | i286 register test has passed |
| 03 | ROM BIOS checksum test (32Kb from F8000h) passed OK |
| 04 | 8259 programmable interrupt controller has initialized OK |
| 05 | CMOS interrupt disabled |
| 06 | Video system disabled and the system timer checks OK |
| 07 | 8253/4 programmable-interval timer test OK |
| 08 | Delta counter channel 2 OK |
| 09 | Delta counter channel 1 OK |
| 0A | Delta counter channel 0 OK |
| 0B | Parity status cleared |
| 0C | The refresh and system timer check OK |
| 0D | Refresh check OK |
| 0E | Refresh period checks OK |
| 10 | Ready to start 64KB base memory test |
| 11 | Address line test OK |
| 12 | 64KB base memory test OK |
| 13 | System-interrupt vectors initialized |
| 14 | 8042 keyboard controller checks OK |
| 15 | CMOS read/write test OK |
| 16 | CMOS checksum and battery OK |
| 17 | Monochrome video mode OK |
| 18 | CGA color mode set OK |
| 19 | Attempting to pass control to video ROM at C0000h |
| 1A | Returned from video ROM |
| 1B | Display memory read/write test OK |
| 1C | Display memory read/write alternative test OK |
| 1D | Video retrace test OK |
| 1E | Global equipment byte set for proper video operation |
| 1F | Ready to initialize video system |
| 20 | Video test OK |
| 21 | Video display OK |
| 22 | The power-on message is displayed |
| 30 | Ready to start the virtual-mode memory test |
| 31 | virtual memory mode test started |
| 32 | CPU has switched to virtual mode |
| 33 | Testing the memory address lines |
| 34 | Testing the memory address lines |
| 35 | Lower 1MB of RAM found |
| 36 | Memory size computation checks OK |
| 37 | Memory test in progress |
| 38 | Memory below 1MB is initialized |
| 39 | Memory above 1MB is initialized |
| 3A | Memory size is displayed |
| 3B | Ready to test the lower 1MB of RAM |
| 3C | Memory test of lower 1MB OK |
| 3D | Memory test above 1MB OK |
| 3E | Ready to shutdown for real-mode testing |
| 3F | Shutdown OK- now in real mode |
| 40 | Ready to disable gate A20 |
| 41 | A20 line disabled successfully |
| 42 | Ready to start DMA controller test |
| 4E | Address line test OK |
| 4F | System still in real mode |
| 50 | DMA page register test OK |
| 51 | Starting DMA controller 1 register test |
| 52 | DMA controller 1 test passed, starting DMA controller 2 register test |
| 53 | DMA controller 2 test passed |
| 54 | Ready to test latch on DMA controller 1 and 2 |
| 55 | DMA controller 1 and 2 latch test OK |
| 56 | DMA controller 1 and 2 configured OK |
| 57 | 8259 programmable interrupt controller initialized OK |
| 58 | 8259 programmable interrupt controller mask register OK |
| 59 | Master 8259 programmable interrupt controller mask register OK |
| 5A | Ready to check timer interrupts |
| 5B | Timer interrupt check OK |
| 5C | Ready to test keyboard interrupt |
| 5D | Error detected in timer or keyboard interrupt |
| 5E | 8259 programmable interrupt controller error |
| 5F | 8259 programmable interrupt controller OK |
| 70 | Start of keyboard test |
| 71 | Keyboard controller Ok |
| 72 | Keyboard tested OK |
| 73 | Keyboard global initialization OK |
| 74 | Floppy setup ready to start |
| 75 | Floppy controller setup OK |
| 76 | Hard disk setup ready to start |
| 77 | Hard disk controller setup OK |
| 79 | Ready to initialize timer data |
| 7A | Verifying CMOS battery power |
| 7B | CMOS battery verified OK |
| 7D | Analyzing CMOS RAM size |
| 7E | CMOS memory size updated |
| 7F | Send control to adapter ROM |
| 80 | Enable the setup routine if <Delete> is pressed |
| 82 | Printer data initialization is OK |
| 83 | RS-232 data initialization is OK |
| 84 | 80×87 check and test OK |
| 85 | Display any soft-error message |
| 86 | Give control to ROM E0000h |
| 87 | Return from system ROM |
| 00 | Call the Int19 boot loader |
AMI BIOS Post Codes (After April 1990)
| 01 | NMI is disabled and the i286 register test is about to start |
| 02 | i286 register test has passed |
| 03 | ROM BIOS checksum test (32KB from E8000h) passed OK |
| 04 | Passed keyboard controller test with and without mouse |
| 05 | Chipset initialized…DMA and interrupt controller disabled |
| 06 | Video system disabled and the system timer checks OK |
| 07 | 8254 programmable interval timer initialized |
| 08 | Delta counter channel 2 initialization complete |
| 09 | Delta counter channel 1 initialization complete |
| 0A | Delta counter channel 0 initialization complete |
| 0B | Refresh started |
| 0C | System timer started |
| 0D | Refresh check OK |
| 10 | Ready to start 64KB base memory test |
| 11 | Address line test OK |
| 12 | 64KB base memory test OK |
| 15 | ISA BIOS interrupt vectors initialized |
| 17 | Monochrome video mode OK |
| 18 | CGA color mode set OK |
| 19 | Attempting to pass control to video ROM at C0000h |
| 1A | Returned from video ROM |
| 1B | Shadow RAM enabled |
| 1C | Display memory read/write test OK |
| 1D | Alternate display memory read/write test OK |
| 1E | Global equipment byte set for proper |
| 1F | Ready to initialize video system |
| 20 | Finished setting video mode |
| 21 | ROM type 27256 verified |
| 22 | The power-on message is displayed |
| 30 | Ready to start the virtual mode memory test |
| 31 | Virtual memory mode test started |
| 32 | CPU has switched to virtual mode |
| 33 | Testing the memory address lines |
| 34 | Testing the memory address lines |
| 35 | Lower 1MB of RAM found |
| 36 | Memory size computation checks OK |
| 37 | Memory test in progress |
| 38 | Memory below 1MB is initialized |
| 39 | Memory above 1MB is initialized |
| 3A | Memory size is displayed |
| 3B | Ready to test the lower 1MB of RAM |
| 3C | Memory test of lower 1MB OK |
| 3D | Memory test above 1MB OK |
| 3E | Ready to shutdown for real-mode testing |
| 3F | Shutdown Ok – now in real mode |
| 40 | Cache memory now on…Ready to disable gate A 20 |
| 41 | A20 line disabled successfully |
| 42 | i486 internal cache turned on |
| 43 | Ready to start DMA controller test |
| 50 | DMA page register test OK |
| 51 | Starting DMA controller 1 register test |
| 52 | DMA controller 1 test passed, starting DMA controller 2 register test |
| 53 | DMA controller 2 test passed |
| 54 | Ready to test latch on DMA controller 1 and 2 |
| 55 | DMA controller 1 and 2 latch test OK |
| 56 | DMA controller 1 and 2 configured OK |
| 57 | 8259 programmable interrupt controller initialized Ok |
| 70 | Start of keyboard test |
| 71 | Keyboard controller OK |
| 72 | Keyboard test OK…Starting mouse interface test |
| 73 | Keyboard and mouse global initialization OK |
| 74 | Display setup prompt.. Floppy setup ready to start |
| 75 | Floppy controller setup OK |
| 76 | hard disk setup ready to start |
| 77 | Hard disk controller setup OK |
| 79 | Ready to initialize timer data |
| 7A | Timer data area initialized |
| 7B | CMOS battery verified OK |
| 7E | CMOS memory size updated |
| 7F | Enable setup routine if <Delete> is pressed |
| 80 | Send control to adapter ROM at C800h to DE00h |
| 81 | Return from adapter ROM |
| 82 | Printer data initialization is OK |
| 83 | RS-232 data initialization is OK |
| 84 | 80×87 check and test OK |
| 85 | Display any soft error message |
| 86 | Give control to ROM at E0000h |
| A0 | Program the cache SRAM |
| A1 | Check for external cache |
| A2 | initialize EISA adapter card slots |
| A3 | Test extended NMI in EISA system |
| 00 | Call the INT19 boot loader |
AMI 2.2 BIOS
| 00 | Flag test; Testing of the CPU |
| 03 | Register test |
| 06 | Chipset test; System hardware initialized |
| 09 | BIOS checksum tested |
| 0C | Page register tested |
| 0F | 8254 timer tested |
| 12 | Memory refresh initialization |
| 15 | 8237 DMA controllers tested |
| 18 | 8237 DMA initialization |
| 1B | 8259 PIC initialization |
| 1E | 8259 PIC chips tested |
| 21 | Memory refresh tested |
| 24 | Base 64 address tested |
| 27 | Base 64 memory tested |
| 2A | 8742 keyboard tested |
| 2D | MC146818 RTC/CMOS |
| 30 | Protected mode started |
| 33 | Memory sizing test |
| 36 | First protected mode test passed |
| 39 | First protected mode test failed |
| 3C | CPU speed calculation |
| 3F | Read 8742 hardware switches |
| 42 | Initialize interrupt vector area |
| 45 | Verify CMOS configuration |
| 48 | Test and initialize video system |
| 4B | Unexpected interrupt tested |
| 4E | Start second protected mode test |
| 51 | Verify LDT instruction |
| 54 | Verify TR instruction |
| 57 | Verify LSL instruction |
| 5A | Verify LAR instruction |
| 5D | Verify VERR instruction |
| 60 | Address line A20 test |
| 63 | Unexpected exception tested |
| 66 | Start third protected mode test |
| 69 | Address line tested |
| 6A | Scan DDNIL bits for null pattern |
| 6C | System memory tested |
| 6F | Shadow memory tested |
| 72 | Extended memory tested |
| 75 | Verify memory configuration |
| 78 | Display CMOS error messages |
| 7B | Copy system BIOS shadow memory |
| 7E | 8254 clock tested |
| 81 | MC146818 RTC tested |
| 84 | Keyboard test |
| 87 | Determine keyboard type |
| 8A | Stuck key test |
| 8D | Initialize hardware Interrupt vectors |
| 90 | Math co-processor tested |
| 93 | Determine COM ports available |
| 96 | Determine LPT ports available |
| 99 | Initialize BIOS data area |
| 9C | Fixed/floppy controller tested |
| 9F | Floppy disk tested |
| A2 | Fixed disk tested |
| A5 | External ROM screen; Check for external ROM’s |
| A8 | System key lock test |
| AE | F1 error message test |
| AF | System boot initialization |
| B1 | Call to Interrupt 19 boot loader |
AMI Plus BIOS
| 00 | Control to Interrupt 19 |
| 01 | NMI disabled (Bit 7 of I/O port 70h) |
| 02 | 286 register test over |
| 03 | ROM checksum OK |
| 04 | 8259 PIC initialization disabled |
| 05 | CMOS Interrupt disabled |
| 06 | System timer (PIT) counting OK |
| 07 | Channel 0 of 8259 PIC test OK |
| 08 | DMA channel 2 of delta count test OK |
| 09 | DMA channel 1 of delta count test OK |
| 0A | DMA channel 0 of delta test count OK |
| 0B | Parity status cleared (DMA/PIT) |
| 0C | Refresh and system time check OK (DMA/PIT) |
| 0D | Refresh link toggling OK (DMA/PIT) |
| 0E | Refresh period ON/OFF 50% OK |
| 10 | About to start 64K memory |
| 11 | Address line tested OK |
| 12 | 64K base memory tested OK |
| 13 | Interrupt vectors initialized |
| 14 | 8042 keyboard controller tested |
| 15 | CMOS Read/Write test OK |
| 16 | CMOS checksum/battery tested |
| 17 | Monochrome mode set OK (6845) |
| 18 | Color (CGA) mode set OK (6845) |
| 19 | Video ROM search |
| 1A | Optional video ROM OK |
| 1B | Display memory Read/Write test OK |
| 1C | Alternate display memory OK |
| 1D | Video retrace check Ok |
| 1E | Global byte set for video Ok |
| 1F | Mode set for mono/color OK |
| 20 | Video test OK |
| 21 | Video display OK |
| 22 | Power on message display OK |
| 30 | Readying virtual mode memory test |
| 31 | Virtual mode memory test started |
| 32 | Processor in virtual mode |
| 33 | Memory address line test |
| 34 | Memory address line test |
| 35 | Memory below 1MB calculated |
| 36 | Memory size computation OK |
| 37 | Memory test in progress |
| 38 | Memory initialization below 1MB |
| 39 | Memory initialization above 1MB |
| 3A | Display memory size |
| 3B | Ready to start memory below 1MB |
| 3C | Memory test below 1MB OK |
| 3D | Memory test above 1MB OK |
| 3E | Ready to switch to real mode |
| 3F | Shutdown successful |
| 40 | Ready to disable gate A-20 (8042) |
| 41 | Gate A-20 disabled (8042) |
| 42 | About to test DMA controller (8237) |
| 4E | Address line test OK |
| 4F | Processor in real mode |
| 50 | DMA page register test OK |
| 51 | DMA unit-1 base register OK |
| 52 | DMA unit-1 channel register OK |
| 53 | DMA channel-2 base register test OK |
| 54 | About to test both units OK |
| 55 | F/F latch tests both units OK |
| 56 | DMA units 1 & 2 programmed OK |
| 57 | 8259 PIC initialization OK |
| 58 | 8259 PIC mask register check OK |
| 59 | Master 8259 PIC mask register OK |
| 5A | Check timer and keyboard Interrupt |
| 5B | PIT timer Interrupt OK |
| 5C | About to test keyboard Interrupt |
| 5D | ERROR! Timer/keyboard Interrupt |
| 5E | 8259 PIC Interrupt controller error |
| 5F | 8259 PIC Interrupt controller test OK |
| 70 | Start of keyboard test |
| 71 | Keyboard test OK |
| 72 | Keyboard test OK |
| 73 | Keyboard global data initialize (8042) |
| 74 | Floppy controller setup about to start |
| 75 | Floppy controller setup OK |
| 76 | Hard disk controller setup about to start |
| 77 | Hard disk controller setup OK |
| 79 | About to initialize timer data |
| 7A | Verify CMOS battery power |
| 7B | CMOS battery verification done |
| 7D | Analyze test results for memory |
| 7E | CMOS memory size update OK |
| 7F | Check optional ROM C0000h |
| 80 | Keyboard sensed to enable setup |
| 81 | Optional ROM control OK |
| 82 | Printer global data init OK |
| 83 | RS-232 global data init OK |
| 84 | 80287 check/test OK |
| 85 | About to display soft error |
| 86 | Give control to system ROM E0000h |
| 87 | System ROM E0000h check over |
| 00 | Call to Interrupt 19 for boot loader |
AMI Color
| 00 | Control to Int 19 boor loader |
| 01 | CPU flag test |
| 02 | Power-on delay |
| 03 | Chipset initialization |
| 04 | Soft/hard reset |
| 05 | ROM enable |
| 06 | ROM BIOS checksum |
| 07 | 8042 keyboard controller tested |
| 08 | 8042 keyboard controller tested |
| 09 | 8042 keyboard controller tested |
| 0A | 8042 keyboard controller tested |
| 0B | 8042 protected mode tested |
| 0C | 8042 keyboard controller tested |
| 0D | 8042 keyboard controller tested, CMOS |
| 0E | CMOS checksum tested |
| 0F | CMOS initialization |
| 10 | CMOS/RTC status OK |
| 11 | DMA/PIC disable |
| 12 | DMA/PIC initialization |
| 13 | Chipset/memory initialization |
| 14 | 8254 PIT timer tested |
| 15 | 8254 PIT channel 2 timer tested |
| 16 | 8254 PIT channel 1 timer tested |
| 17 | 8254 PIT channel 0 timer tested |
| 18 | Memory refresh test (PIC) |
| 19 | Memory refresh test (PIC) |
| 1A | Check 15-microsecond refresh (PIT) |
| 1B | Check 30-microsecond refresh (PIT) |
| 20 | Base 64K memory tested |
| 21 | Base 64K memory parity tested |
| 22 | Memory Read/Write |
| 23 | BIOS vector table initialization |
| 24 | BIOS vector table initialization |
| 25 | Turbo check of 8042 keyboard controller |
| 26 | Global data table for keyboard controller; turbo |
| 27 | Video mode tested |
| 28 | Monochrome tested |
| 29 | Color (CGA) tested |
| 2A | Parity-enable tested |
| 2B | Optional system ROM’s check start |
| 2C | Video ROM check |
| 2D | Reinitialize main chipset |
| 2E | Video memory tested |
| 2F | Video memory tested |
| 30 | Video adapter tested |
| 31 | Alternate video adapter tested |
| 32 | Alternate video adapter tested |
| 33 | Video mode tested |
| 34 | Video mode tested |
| 35 | Initialize BIOS ROM data area |
| 36 | Power-on message display |
| 37 | Power-on message display |
| 38 | Read cursor position |
| 39 | Display cursor reference |
| 3A | Display BIOS setup message |
| 40 | Start protected mode tested |
| 41 | Build mode entry |
| 42 | CPU enters protected mode |
| 43 | Protected mode Interrupt enable |
| 44 | Check descriptor tables |
| 45 | Check memory size |
| 46 | Memory Read/Write tested |
| 47 | Base 640K memory tested |
| 48 | Check 640K memory size |
| 49 | Check extended memory size |
| 4A | Verify CMOS extended memory |
| 4B | Check for soft/hard reset |
| 4C | Clear extended memory locations |
| 4D | Update CMOS memory size |
| 4E | Base RAM size displayed |
| 4F | Memory Read/Write test on 640K |
| 50 | Update CMOS on RAM size |
| 51 | Extended memory tested |
| 52 | Re-size extended memory |
| 53 | Return CPU to real mode |
| 54 | Restore CPU registers |
| 55 | A-20 gate disabled |
| 56 | BIOS vector recheck |
| 57 | BIOS vector check complete |
| 58 | Clear BIOS display setup message |
| 59 | DMA, PIT tested |
| 60 | DMA page register tested |
| 61 | DMA #1 tested |
| 62 | DMA #2 tested |
| 63 | BIOS data area check |
| 64 | BIOS data area checked |
| 65 | Initialize DMA chips |
| 66 | 8259 PIC initialization |
| 67 | Keyboard tested |
| 80 | Keyboard reset |
| 81 | Stuck key and batch test |
| 82 | 8042 keyboard controller tested |
| 83 | Lock key check |
| 83 | Compare memory size with CMOS |
| 85 | Password/soft error check |
| 86 | XCMOS/CMOS equipment check |
| 87 | CMOS setup entered |
| 88 | Reinitialize chipset |
| 89 | Display power-on message |
| 8A | Display wait and mouse check |
| 8B | Shadow any option ROM’s |
| 8C | Initialize XCMOS settings |
| 8D | Reset hard/floppy drives |
| 8E | Floppy compare to CMOS |
| 8F | Floppy disk controller initialization |
| 90 | Hard disk compare to CMOS |
| 91 | Hard disk controller initialization |
| 92 | BIOS data table check |
| 93 | BIOS data check hat halfway |
| 94 | Set memory size |
| 95 | Verify display memory |
| 96 | Clear all Interrupts |
| 97 | Optional ROM’s check |
| 98 | Clear all Interrupts |
| 99 | Setup timer data/RS232 base |
| 9A | RS232 test; Locate and test serial ports |
| 9B | Clear all Interrupts |
| 9C | NPU test |
| 9D | Clear all Interrupts |
| 9E | Extended keyboard check |
| 9F | Set numlock |
| A0 | Keyboard reset |
| A1 | Cache memory test |
| A2 | Display any soft errors |
| A3 | Set typematic rate |
| A4 | Set memory wait states |
| A5 | Clear screen |
| A6 | Enable parity/NMI |
| A7 | Clear all Interrupts |
| A8 | Control to ROM at E0000 |
| A9 | Clear all Interrupts |
| AA | Display configuration |
| 00 | Call to Interrupt 19 boot loader |
AMI Win BIOS
| 00 | Control to Int 19 boot loader |
| 01 | Disable NMI |
| 02 | Power-on delay |
| 03 | Soft reset power-on |
| 05 | Disable cache |
| 06 | Uncompressed POST code |
| 08 | CMOS checksum |
| 08 | CMOS initialization |
| 0A | CMOS initialization for date and time |
| 0B | Initialization before keyboard batch |
| 0C | Batch command to keyboard controller |
| 0D | Verify batch command |
| 0E | Initialize after KB controller batch |
| 0F | Write KB command byte |
| 10 | Pin 23/24 block/unblock command |
| 11 | Check for <INS> key command |
| 12 | DMA/PIC disable |
| 13 | Chipset initialization |
| 14 | 8254 timer test |
| 19 | Memory refresh test |
| 20 | Base 64K memory test |
| 23 | Set BIOS stack, setup before int. vector init |
| 24 | Interrupt vector initialization |
| 25 | Read input port of 9042 chip, clear password |
| 26 | Initialize global data for turbo switch |
| 27 | Initialize before setting video mode |
| 28 | Set video mode |
| 2A | Initialize BUS |
| 2B | Setup before operational video check |
| 2C | Control to optional video ROM |
| 2D | Proc. after optional video ROM routine |
| 2E | Display memory Read/Write test if no EGA/VGA |
| 2F | Display memory Read/Write test |
| 30 | Retrace check |
| 31 | Display alternate memory Read/Write check |
| 32 | Alternate display retrace check |
| 34 | Set display mode |
| 37 | Display power-on message |
| 38 | Initialize BUS types |
| 39 | Display BUS initialization error messages |
| 3A | Display the hit <DEL> message |
| 3B | Virtual modem memory test |
| 40 | Prepare descriptor tables |
| 42 | Enter virtual mode for memory test |
| 43 | Enable Interrupts for diagnostic mode |
| 44 | Initialize data to check memory wrap at 0:0 |
| 45 | Check memory wrap, find total memory amount |
| 46 | Memory write test |
| 47 | 640K base memory write test |
| 48 | Determine memory below 1MB |
| 49 | Determine memory above 1MB |
| 4B | Check for soft reset, clear memory below 1MB |
| 4C | Clear memory above 1MB |
| 4D | Save memory size |
| 4E | Display first 64K memory size |
| 4F | Sequential and random memory test |
| 50 | Displayed memory size |
| 51 | Above 1MB memory test |
| 52 | Save memory size information |
| 53 | Enter real mode |
| 54 | Disable gate A-20 line |
| 57 | Adjust memory size |
| 58 | Clear hit <DEL> message |
| 59 | DMA/PIC test |
| 60 | DMA #1 base register test |
| 62 | DMA #2 base register test |
| 65 | Program DMA unit 1 and 2 |
| 66 | Initialize 8259 Interrupt controller |
| 67 | Keyboard test |
| 7F | Enable extended NMI sources |
| 80 | Stuck key and batch test |
| 81 | Keyboard controller test |
| 82 | Write command byte, initialize circular buffer |
| 83 | Lock key check |
| 84 | Compare memory size with CMOS |
| 85 | Password/soft error check |
| 86 | Programming before check |
| 87 | Execute CMOS setup |
| 88 | Programming after setup |
| 89 | Power-on display |
| 8B | Shadow main and video BIOS |
| 8C | Setup options after CMOS setup |
| 8D | Initialize mouse |
| 8E | Reset hard disk controller |
| 8F | Floppy setup |
| 91 | Hard disk setup |
| 94 | Base/extended memory size |
| 95 | Init. PCI/VLB BUS optional ROM’s from C800 |
| 96 | Initialize before C800 optional ROM control |
| 97 | Control to optional ROM |
| 98 | Processing after optional ROM control |
| 99 | Setup timer data area/printer base address |
| 9A | Set RS-232 base address |
| 9B | Initialize before NPU test |
| 9C | NPU initialization |
| 9D | Initialization after NPU test |
| 9E | Check extended KB, KB ID and num-lock |
| 9F | Issue keyboard ID command |
| A0 | Reset keyboard ID flag |
| A1 | Cache memory test |
| A2 | Display and soft errors |
| A4 | Program memory wait states |
| A5 | Clear screen, enable parity NMI |
| A7 | Init. needed before control to E000 ROM |
| A8 | Control to E000 ROM |
| A9 | Init. needed after control to E000 ROM |
| AA | Display system configuration |
| B0 | Uncompressed SETUP code for hot-key |
| B1 | Copy any code to specific area |
| C2 | Disable NMI, power-on delay |
| C5 | Enable ROM, disable cache |
| C6 | ROM BIOS checksum |
| C7 | CMOS shutdown register test |
| C8 | CMOS shutdown |
| CA | Initialize CMOS date and time |
| CB | Initialization before keyboard batch |
| CD | BAT command to keyboard controller |
| CE | Installation after keyboard controller batch |
| CF | Write keyboard command byte |
| D1 | Check for <INS> key command |
| D2 | Disable DMA and Interrupt controllers |
| D3 | Chipset initialization/auto detect memory |
| D4 | Uncompressed RUNTIME code |
| D5 | RUNTIME code uncompressed |
| DD | Control to shadow RAM at F000:F000 |
AMI Ez-Flex BIOS
| 01 | NMI disabled; Start CPU flag test |
| 02 | Power on delay |
| 03 | Initialize system chipset |
| 04 | Check keyboard for soft/hard reset |
| 05 | Enable ROM |
| 06 | ROM BIOS checksum tested |
| 07 | 8042 keyboard controller tested |
| 08 | 8042 keyboard controller tested |
| 09 | 8042 keyboard controller tested |
| 0A | 8042 keyboard controller tested |
| 0B | 8042 protected mode tested |
| 0C | 8042 keyboard controller tested |
| 0D | CMOS RAM shutdown register tested |
| 0E | CMOS checksum tested |
| 0F | CMOS initialization |
| 10 | CMOS/RTC status OK |
| 11 | Disable DMA and PIC |
| 12 | Video display disabled |
| 13 | Chipset and memory initialized |
| 14 | 8254 PIT tested |
| 15 | PIT channel 2 tested |
| 16 | PIT channel 1 tested |
| 17 | PIT channel 0 tested |
| 18 | PIT memory refresh tested |
| 19 | PIT memory refresh tested |
| 1A | Check 15 microsecond refresh (PIT) |
| 1B | Base 64K memory tested |
| 20 | Address lines tested |
| 21 | Base 64K parity memory tested |
| 22 | Memory Read/Write tested |
| 23 | Perform setup’s prior to initialization of the vector table |
| 24 | Initialize BIOS vector table in lower 1KB of system RAM |
| 25 | 8042 keyboard controller tested |
| 26 | Global for keyboard controller tested |
| 27 | Perform setups for vector table initialization |
| 28 | Monochrome video mode tested |
| 29 | Video (CGA) color mode tested |
| 2A | Parity enable tested |
| 2B | Check for optional ROM’s |
| 2C | Check for video ROM |
| 2D | Determine if EGA/VGA is installed |
| 2E | Video memory is tested if non EGA/VGA |
| 2F | Video memory tested |
| 30 | Video adapter tested |
| 31 | Alternate video memory tested |
| 32 | Alternate video adapter tested |
| 33 | Video mode tested |
| 34 | Video mode tested |
| 35 | BIOS ROM data area initialized |
| 36 | Power on display cursor set |
| 37 | Power on message displayed |
| 38 | Cursor position read |
| 39 | Display cursor reference |
| 3A | Display Setup message |
| 40 | Protected mode tested |
| 41 | Build descriptor tables |
| 42 | CPU enters protected mode |
| 43 | Protected mode interrupt enabled |
| 44 | Descriptor tables checked |
| 45 | Memory size checked |
| 46 | Memory read/Write tested |
| 47 | Base 640K memory tested |
| 48 | Memory below 1MB checked for |
| 49 | Memory above 1MB checked for |
| 4A | ROM BIOS data area checked |
| 4B | Memory below 1MB cleared for soft reset |
| 4C | Memory above 1MB cleared for soft reset |
| 4D | Update CMOS memory size |
| 4E | Display base 64K memory test |
| 4F | Memory test on base 640K performed |
| 50 | RAM size updated for shadow operation |
| 51 | Extended memory test performed |
| 52 | System is prepared for real mode |
| 53 | CPU is returned to real mode |
| 54 | CPU registers are returned to real mode |
| 55 | A20 gate disabled |
| 56 | BIOS data area rechecked |
| 57 | BIOS data area check complete |
| 58 | Setup message displayed |
| 59 | DMA register page tested |
| 60 | Display memory verified |
| 61 | DMA #1 tested |
| 62 | DMA #2 tested |
| 63 | Perform BIOS data area check |
| 64 | BIOS data area checked |
| 65 | DMA initialized |
| 66 | 8259 PIC initialized |
| 67 | Keyboard tested |
| 80 | Keyboard reset |
| 81 | Check for stuck key and batch test |
| 82 | 8042 keyboard controller tested |
| 83 | Lock key checked |
| 84 | Memory size compared to CMOS |
| 85 | Password and soft error checked |
| 86 | CMOS equipment checked performed |
| 87 | CMOS setup performed if selected |
| 88 | Main chipset reinitialized after CMOS setup |
| 89 | Power on message displayed |
| 8A | Mouse check and wait message displayed |
| 8B | Any ROM’s attempted to be shadowed |
| 8C | System initialized through CMOS settings |
| 8D | Hard drives and floppy drives reset |
| 8E | Floppy disk setup compared to CMOS settings |
| 8F | Floppy controller initialized |
| 90 | Hard disks setup compared to CMOS settings |
| 91 | Hard disk controller initialized |
| 92 | BIOS data table checked |
| 93 | BIOS data table check complete |
| 94 | Memory size set |
| 95 | Display memory verified |
| 96 | All Interrupts cleared |
| 97 | Optional ROM’s checked for |
| 98 | All Interrupts cleared |
| 99 | Timer data setup |
| 9A | Serial ports checked for |
| 9B | All Interrupts cleared |
| 9C | Math coprocessor checked |
| 9D | All Interrupts cleared |
| 9E | Extended keyboard checked |
| 9F | NumLock set on keyboard |
| A0 | Keyboard reset |
| A1 | Cache memory size tested |
| A2 | Display any soft errors |
| A3 | Typematic rate set |
| A4 | Memory wait states set |
| A5 | Display is cleared |
| A6 | Parity and NMI enabled |
| A7 | All Interrupts cleared |
| A8 | System control is turned over to ROM at E0000 |
| A9 | All Interrupts cleared |
| AA | Displayed configuration |
| 00 | Call to Interrupt 19 for boot loader |
Source:
Bios Central
February 22, 2014 Categories: