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

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Compaq 486 BIOS Post Codes

  • 01 - CPU test failed
  • 02 - Coprocessor or Weitek error
  • 03 - DMA page registers
  • 04 - Interrupt controller master
  • 05 - Port 61 error
  • 06 - Keyboard controller self test
  • 07 - CMOS RAM test failed
  • 08 - CMOS interrupt test failed
  • 09 - CMOS clock load data test
  • 10 - Programmable timer
  • 11 - Refresh detect test failed
  • 12 - Speed test slow mode out of range
  • 13 - Protected mode test failed
  • 14 - Speaker test failed
  • 16 - Cache memory configuration
  • 19 - Installed devices test
  • 21 - Memory machine ID test failed
  • 22 - Memory system ROM checksum
  • 23 - Memory read/write test failed
  • 24 - Memory address test failed
  • 25 - Walking I/O test failed
  • 26 - Increment pattern test failed
  • 31 - Keyboard short test, 8042
  • 32 - Keyboard long test failed
  • 33 - Keyboard LED test, 8042
  • 34 - Keyboard typematic test failed
  • 41 - Printer failed or not connected
  • 42 - Printer data register failed
  • 43 - Printer pattern test
  • 48 - Printer not connected
  • 51 - Video controller test failed
  • 52 - Video memory test failed
  • 53 - Video attribute test failed
  • 54 - Video character set test failed
  • 55 - Video 80 x 25 mode
  • 56 - Video 80 x 25 mode
  • 57 - Video 40 x 25 mode test failed
  • 58 - Video 320 x 200 mode color set 1
  • 59 - Video 320 x 200 mode color set 1
  • 60 - Diskette ID drive types test
  • 61 - Diskette format failed
  • 62 - Diskette read test failed
  • 63 - Diskette write, read, random seek
  • 65 - Diskette media ID failed
  • 66 - Diskette speed test failed
  • 67 - Diskette wrap test failed
  • 68 - Diskette write protect test
  • 69 - Diskette reset controller test
  • 82 - Video memory test failed
  • 84 - Video adapter test failed
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