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

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Dell BIOS Post Codes

  • 01 - CPU register test in progress
  • 02 - CMOS read/write test failed
  • 03 - BIOS ROM checksum bad
  • 04 - 8254 programmable interrupt controller failed
  • 05 - DMA controller initialization failed
  • 06 - DMA page-register test failed
  • 08 - RAM refresh verification failed
  • 09 - Starting first-64K RAM test
  • 0A - First-64KB RAM IC or data line bad
  • 0B - First-64KB RAM odd/even logic bad
  • 0C - First-64KB address line bad
  • 0D - First-64KB parity error
  • 10 - Bit 0 bad in first 64KB
  • 11 - Bit 1 bad in first 64KB
  • 12 - Bit 2 bad in first 64KB
  • 13 - Bit 3 bad in first 64KB
  • 14 - Bit 4 bad in first 64KB
  • 15 - Bit 5 bad in first 64KB
  • 16 - Bit 6 bad in first 64KB
  • 17 - Bit 7 bad in first 64KB
  • 18 - Bit 8 bad in first 64KB
  • 19 - Bit 9 bad in first 64KB
  • 1A - Bit 10 bad in first 64KB
  • 1B - Bit 11 bad in first 64KB
  • 1C - Bit 12 bad in first 64KB
  • 1D - Bit 13 bad in first 64KB
  • 1E - Bit 14 bad in first 64KB
  • 1F - Bit 15 bad in first 64KB
  • 20 - Slave DMA register bad
  • 21 - Master DMA register bad
  • 22 - Master interrupt-mask register bad
  • 23 - Slave interrupt-mask register bad
  • 25 - Loading interrupt vectors
  • 27 - Keyboard-controller test failed
  • 28 - CMOS RAM battery bad
  • 29 - CMOS configuration validation in progress
  • 2B - Video-memory test failed
  • 2C - Video initialization failure
  • 2D - Video-retrace failure
  • 2E - Searching for a video ROM
  • 30 - Switching to video ROM
  • 31 - Monochrome operation OK
  • 32 - Color (CGA) operation OK
  • 33 - Color operation OK
  • 34 - Timer-tick interrupt in progress (or bad)
  • 35 - CMOS shutdown test in progress (or bad)
  • 36 - Gate A20 bad
  • 37 - Unexpected interrupt in protected mode
  • 38 - RAM test in progress or high address line is bad
  • 3A - Interval timer channel 2 bad
  • 3B - Time-of-day test bad
  • 3C - Serial-port test bad
  • 3D - Parallel -port test bad
  • 3E - Math co-processor test bad
  • 3F - Cache-memory test bad
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