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

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Award original XT BIOS Post Codes

  • 03 - Flag resister test
  • 06 - CPU register test
  • 09 - System hardware initialization
  • 0C - BIOS checksum
  • 0F - DMA page register initialization
  • 12 - Test DMA address and count registers
  • 15 - DMA initialization
  • 18 - Timer test
  • 1B - Timer initialization
  • 1E - Start RAM initialization
  • 21 - Test base 64K of RAM
  • 24 - Setup init. and temp stack
  • 27 - Initialize PIC
  • 2A - Interrupt mask register test
  • 2D - Hot interrupt test
  • 30 - V40 DMA if present
  • 33 - Verify system clock initialization
  • 36 - Keyboard test
  • 39 - Setup interrupt table
  • 3C - Read system configuration switches
  • 3F - Video test
  • 42 - Serial port determination
  • 45 - Parallel port determination
  • 48 - Game port determination
  • 4B - Copyright message display
  • 4E - Calculation of CPU speed
  • 54 - Test of system memory
  • 55 - Floppy drive test
  • 57 - System initialized before boot
  • 5A - Call to Int 19
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