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

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DTK AT BIOS Post Codes

  • 01 - Testing the CPU
  • 03 - Initialize the 8259 interrupt controller
  • 05 - Initialize the video board - MCA & CGA
  • 0D - Initialize the 8237 DMA controller
  • 0E - Initialize the DMA 74612 page registers
  • 12 - Test the 8042 keyboard controller
  • 16 - Test the DMA 7237 controller and 8254 programmable interrupt timer
  • 22 - Testing DRAM refresh circuitry
  • 25 - Base 64KB memory test
  • 30 - Set up system stack
  • 33 - Read-system configuration through 8042 keyboard controller
  • 37 - Test keyboard clock and data line
  • 40 - Determine video type
  • 44 - Locate and test, if present, MDA and CGA video
  • 48 - Initialize video 80 x 25 mode
  • 4D - Display DTK BIOS copyright message
  • 4F - Check serial and parallel ports
  • 50 - Check floppy disk controller
  • 55 - Check shadow RAM
  • 58 - Display total memory and switch to real mode
  • 5A - Successful switch back to real mode
  • 60 - Check hard disk drive controller
  • 62 - Initialize floppy drive
  • 65 - Initialize hard drive
  • 67 - Initialize the floppy disk drive and the hard disk drive
  • 6A - Disable gate A20 and test math coprocessor
  • 70 - Set system date and time RTC-146918
  • 77 - Call interrupt 19 boot loader
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