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

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NCR AT BIOS Post Codes

  • 01 - Test the CPU registers
  • 02 - Test system support I/O
  • 03 - Test BIOS ROM checksum
  • 04 - Test DMA page registers
  • 05 - Test timer channel 1
  • 06 - Test timer channel 2
  • 07 - Test RAM refresh logic
  • 08 - Test base 64KB
  • 09 - Test 8/16 bit bus conversion
  • 0A - Test interrupt controller 1
  • 0B - Test interrupt controller 2
  • 0C - Test I/O controller
  • 0D - Test CMOS RAM read/write operation
  • 0E - Test battery power
  • 0F - Test CMOS RAM checksum
  • 10 - Test CPU protected mode
  • 11 - Test video configuration
  • 12 - Test primary video controller
  • 13 - Test secondary video controller
  • 20 - Display results of tests to this point
  • 21 - Test DMA controller 1
  • 22 - Test DMA controller 2
  • 23 - Test system timer channel 0
  • 24 - Initialize interrupt controllers
  • 25 - Test interrupts
  • 26 - Test interrupts
  • 30 - Check base 640KB memory
  • 31 - Check extended memory size
  • 32 - Test higher 8 address lines
  • 33 - Test base memory
  • 34 - Test extended memory
  • 40 - Test keyboard
  • 41 - Test keyboard
  • 42 - Test keyboard
  • 43 - Test keyboard
  • 44 - Test A20 gate
  • 50 - Setup hardware interrupt vectors
  • 51 - Enable interrupt timer channel 0
  • 52 - Check BIOS ROM
  • 60 - Test floppy disk controller and drive
  • 61 - Test hard disk controller
  • 62 - Initialize floppy drives
  • 63 - Initialize hard drives
  • 70 - Test real time clock
  • 71 - Set time of day in RTC
  • 72 - Check parallel interface ports
  • 73 - Check serial interface ports
  • 74 - Check for any option ROM's
  • 75 - Check math coprocessor
  • 76 - Enable keyboard and RTC interrupts
  • F0 - System not configured properly or hardware defect
  • F1 - Scan and execute any option ROM's
  • F2 - Call interrupt 19 boot loader
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