AMI 1990 and prior BIOS POST Codes
- 00 - Going to Give Control to INT 19H Boot Loader
- 01 - 286 Register Test Failed
- 02 - ROM BIOS Checksum (32KB at F800:0) Failed
- 03 - ROM BIOS Checksum (32KB at F800:0) Passed
- 04 - 8259 Interrupt Controller Initialization
- 05 - Chipset Initialization Over, DMA & Interrupt Controller Disabled
- 06 - Video Disabled and System Timer Test Begin
- 07 - CH-2 of 8254 Initialization Half Way
- 08 - 8254 CH-2 Timer Test to be Completed
- 09 - 8254 CH-1 Timer Test to be Completed
- 0A - 8254 CH-0 Timer Test to be Completed
- 0B - DRAM Refresh Failure
- 0C - System Timer Started
- 0D - Refresh Link Toggling Passed
- 0E - Refresh Period ON/OFF 50% OK
- 10 - Refresh ON and About to Start 64KB Base Memory Test
- 11 - Address Line Test Passed
- 12 - 64KB Base Memory Test Passed
- 13 - Interrupt Vectors Initialized
- 14 - 8042 Keyboard Controller Test Passed
- 15 - CMOS Read/Write Test Passed
- 16 - CNOS Checksum and Battery Check Passed
- 17 - Monochrome Mode Set
- 18 - Color Mode Set
- 19 - Give Control to the Optional Video ROM at Segment C000 if present
- 1A - Return from Optional Video ROM
- 1B - Display Memory Read/Write Test Passed
- 1C - Alternate Display Memory Read/Write Test Passed
- 1D - Video Retrace Check Passed
- 1E - Global Equipment Byte Set for Proper Display Type
- 1F - Video Mode Set Call for Mono/Color Begins
- 20 - Video Mode Set Completed
- 21 - ROM Type Verified, Video Display OK
- 22 - Power On Message Displayed
- 23 - Power On Message Displayed
- 30 - Virtual Mode Memory Test About to Begin
- 31 - Virtual Mode Memory Test Started
- 32 - Processor Executing in Virtual Mode
- 33 - Memory Address Line Test in Progress
- 34 - Memory Address Line Test in Progress
- 35 - Memory Below 1MB Calculated
- 36 - Memory Above 1MB Calculated, Memory Size Computation OK
- 37 - Memory Test About to Start
- 38 - Memory Below 1MB Initialized
- 39 - Memory Above 1MB Initialized
- 3A - Memory Size Display Initiated
- 3B - About to Start Below 1MB Memory Test
- 3C - Memory Test Below 1MB Completed
- 3D - Memory Test Above 1MB Completed
- 3E - About to go to Real Mode (Shutdown)
- 3F - Shutdown Successful and Processor in Real Mode
- 40 - Cache Memory ON and About to Disable A20 Address Line
- 41 - Gate A-20 Line Disabed Successfully
- 42 - 486 Internal Cache Turned ON
- 43 - About to Start DMA Controller Test
- 4E - Address Line Test Passed
- 4F - Processor in Real Mode After Shutdown
- 50 - DMA Page Register Test Complete
- 51 - DMA Unit-1 Base Register Test About to Start
- 52 - DMA Unit-1 Base Register Test Complete
- 53 - DMA Unit-2 Base Register Test Complete
- 54 - About to Check F/F Latch for Unit-1 and Unit-2
- 55 - F/F Latch for Both Units Checked
- 56 - DMA Unit-1 and 2 Programming Over
- 57 - 8259 Initialization Over
- 58 - 8259 Mask Register Check Passed
- 59 - Master 8259 Mask Register Passed
- 5A - About to Check Timer and Keyboard Interrupt Level
- 5B - Timer Interrupt Passed
- 5C - About to Test Keyboard Interrupt
- 5D - Error! Timer/Keyboard Interrupt Not in Proper Level
- 5E - 8259 Interrupt Controller Error
- 5F - 8259 Interrupt Controller Test Passed
- 70 - About to Start Keyboard Test
- 71 - Keyboard Controller BAT Test Over
- 72 - Keyboard Interface Test Over, Mouse Interface Test Started
- 73 - Global Data Initialization for Keyboard/Mouse Over
- 74 - Display \"Setup\" Prompt and About to Start Floppy Setup
- 75 - Floppy Setup Over
- 76 - Hard Disk Setup About to Start
- 77 - Hard Disk Setup Over
- 79 - About to Initialize Timer Data Area
- 7A - Time Data Area Initialized and About to Verify CMOS Battery Power
- 7B - CMOS Battery Verification Over
- 7D - About to Analyze POST Test Results
- 7E - CMOS Memory Size Updated
- 7F - Look for <DEL> Key and Get into CMOS Setup if Found
- 80 - About to Give Control to Optional ROM in Segment C800 to DE00 (Setup)
- 81 - Optional ROM Control Over
- 82 - Check for Printer Ports and put the Addresses in Global Data Area
- 83 - Check for RS232 Ports and Put the Addresses in Global Data Area
- 84 - Co-processor Detection Over
- 85 - About to Display Soft Error Messages
- 86 - About to Give Control to System ROM at Segment E000
- 87 - System ROM E000:0 Check Over