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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
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