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Quadtel XT BIOS Post Codes

  • 03 - Test flag register
  • 06 - Test CPU register
  • 09 - Initialize system hardware
  • 0C - Test BIOS ROM checksum
  • 0F - Initialize 8237 DMA page register
  • 12 - Test 8237 DMA address and count registers
  • 15 - Initialize 8237 DMA controller
  • 18 - Test 8253 programmable interrupt timer
  • 1B - Initialize 8253 programmable interrupt timer
  • 1E - Start memory refresh test
  • 21 - Test base 64K RAM
  • 24 - Set up common interrupt temp stack
  • 27 - Initialize 8259 programmable interrupt controller
  • 2A - Test interrupt mask register
  • 2D - Test for unexpected interrupt
  • 30 - Test V40 DMA if present
  • 31 - Test for DDNIL bits if present
  • 33 - Verify system clock interrupt
  • 36 - Test keyboard
  • 39 - Set up interrupt table
  • 3C - Read system configuration switches
  • 3F - Test video
  • 42 - Determine serial ports available
  • 45 - Determine parallel ports available
  • 48 - Determine if game port available
  • 4B - Display copyright message
  • 4E - Calculate CPU speed
  • 54 - Test system memory
  • 55 - Test floppy drive
  • 57 - Initialize system before boot
  • 5A - Call interrupt 19 boot loader
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