post code master - the site for BIOS, POST & BEEP code information

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AST BIOS POST Codes

  • 00 - Reserved; Beep and halt if error occurs
  • 01 - Test CPU registers
  • 02 - Test the 8042 keyboard controller buffer
  • 03 - Test the 8042 keyboard controller reset
  • 04 - Verify presence of keyboard and check communication
  • 05 - Read keyboard input port (WS386SX16)
  • 06 - Initialize system board support chipset
  • 09 - Test BIOS ROM checksum
  • 0D - Test 8254 programmable interrupt timer registers
  • 0E - Test ASIC registers (CLEM only)
  • 0F - Test CMOS RAM shutdown byte
  • 10 - Test DMA controller 0 registers
  • 11 - Test DMA controller 1 registers
  • 12 - Test DMA page registers (EGA.VGA vertical retrace failed)
  • 13 - EGA/VGA RAM test failed
  • 14 - Test memory refresh toggle (EGA/VGA CRT registers failed)
  • 15 - Test base 64KB memory
  • 16 - Set interrupt vectors in base memory
  • 17 - Initialize video
  • 18 - Test display memory
  • 20 - EISA bus board power on (EISA systems only)
  • 30 - Test programmable interrupt controller #1 mask register
  • 31 - Test programmable interrupt controller #2 mask register
  • 32 - Test programmable interrupt controller's for stuck interrupts
  • 33 - Test for stuck NMI (P386 25.33, P486, CLAM and EISA)
  • 34 - Test for stuck DDNIL status (CLEM only)
  • 40 - Test CMOS RAM backup battery
  • 41 - Calculate and verify CMOS checksum
  • 42 - Setup CMOS RAM options (except WS386SX16)
  • 50 - Test the protected mode
  • 51 - Test protected mode exceptions
  • 60 - Calculate RAM size
  • 61 - Test RAM
  • 62 - Test shadow RAM (WS386SX16, P386 25/33, P486, CLEM, EISA); test cache P386/16)
  • 63 - Test cache memory (P386 25/33, P486, CLEM, EISA); copy video BIOS to shadow RAM (p386C, P386/16, WS386SX16)
  • 64 - Copy system BIOS to shadow RAM (P386 25/33, P486, CLEM,EISA); Copy video BIOS to shadow RAM (P386 16, WS386SX16)
  • 65 - Copy video BIOS to shadow RAM P386 25/33, P486, CLEM,EISA); Test cache (WS386SX16)
  • 66 - Test 8254 programmable interrupt timer channel 2 (P386 25/33, P486, EISA)
  • 67 - Initialize memory (Eagle only)


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