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Chips & Technologies BIOS Post Codes

  • 00 - Error in POS Registers
  • 01 - Flag Register Failed
  • 02 - CPU Register Failed
  • 03 - ROM Did Not Checksum
  • 04 - DMA Controller Failed
  • 05 - System Timer Failed
  • 06 - Base 64K Failed Address Test, No Memory Installed, or Improper Config.
  • 07 - Base 64K Failed RAM Test
  • 08 - Interrupt Controller Failed
  • 09 - Hot Interrupt Occurred
  • 0A - System Timer Doesn't Interrupt
  • 0B - CPU Still in Protected Mode
  • 0C - DMA Page Registers Failed
  • 0D - Refresh Not Occurring
  • 0E - Keyboard Controller Not Responding
  • 0F - Could Not Enter Protected Mode
  • 10 - GDT or IDT Failed
  • 11 - LDT Register Failed
  • 12 - Task Register Failed
  • 13 - LSL Intruction Failed
  • 14 - LAR Instruction Failed
  • 15 - VERR/VERW Failed
  • 16 - Keyboard Controller A20 Failed
  • 17 - Exception Failed/Unexpected
  • 18 - Shutdown During Memory Test
  • 19 - Last Used Error Code
  • 1A - Copyright Checksum Error
  • 1B - Shutdown During Memory Sizing
  • 1C - CHIPSet Initialization
  • 50 - Initialize Hardware
  • 51 - Initialize Timer
  • 52 - DMA Initialization
  • 53 - 8259 Initialization
  • 54 - Initialize CHIPSet
  • 55 - Set up BMS Configuration
  • 56 - Entering Protected Mode for First Time
  • 57 - Size Memory Chips
  • 58 - Configure Memory Chip Interleave
  • 59 - Exiting Protected Mode for First Time
  • 5A - Determine System Board Memory Size
  • 5B - Relocate Shadow RAM
  • 5C - Configure EMS
  • 5D - Set Up Wait State Configuration
  • 5E - Re-test Base 64K RAM after RAM Sizing
  • 5F - Test Shadow RAM
  • 60 - CMOS Test
  • 61 - Video Test
  • 63 - Protected Mode Interrupt Test
  • 64 - Test Line A20
  • 65 - Test Memory Address Lines
  • 66 - Memory Test
  • 67 - Extended Memory Test
  • 68 - Timer Interrupt Test
  • 69 - Real-Time Clock (RTC) Test
  • 6A - Keyboard Test
  • 6B - Math Coprocessor Test
  • 6C - RS232 Test
  • 6D - Parallel Test
  • 6E - Dual Card Test
  • 6F - Floppy Test
  • 70 - Fixed Disk Test
  • 71 - Keylock Test
  • 72 - Pointing Device Test
  • 90 - RAM Setup
  • 91 - Calculate CPU Speed
  • 92 - Check Configuration
  • 93 - BIOS Initialization
  • 94 - Power On Diagnostic (POD) Bootstrap
  • 95 - Reset ICs
  • 96 - Cache/Controller Test and Initialization
  • 97 - VGA power on diagnostics and setup
  • 98 - Adapter BIOS
  • 99 - Re-initialize DDNIL bits
  • A0 - Exception 0
  • A1 - Exception 1
  • A2 - Exception 2
  • A3 - Exception 3
  • A4 - Exception 4
  • A5 - Exception 5
  • A6 - Exception 6
  • A7 - Exception 7
  • A8 - Exception 8
  • A9 - Exception 9
  • AA - Exception A
  • AB - Exception B
  • AC - Exception C
  • AD - Exception D
  • C0 - System board memory failure
  • C1 - I/O channel check activated
  • C2 - Watchdog timer timeout
  • C3 - Bus timer timeout
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