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NCR PC916 BIOS Post Codes

  • 01 - Test CPU registers
  • 02 - Verify port 61h
  • 03 - Test BIOS ROM checksum
  • 04 - Test DMA page registers
  • 05 - Test timer channel 1
  • 06 - Test timer channel 2
  • 07 - Test refresh logic
  • 08 - Test base 64KB RAM
  • 09 - Test 8/16 bit bus conversion logic
  • 0A - Test interrupt mask register A
  • 0B - Test interrupt mask register B
  • 0C - Test 8042 keyboard controller
  • 0D - Test CMOS RAM shutdown byte
  • 0E - Test CMOS RAM battery power
  • 0F - Test CMOS RAM checksum
  • 10 - Test CPU protected mode
  • 11 - Test video configuration
  • 12 - Initialize and test primary video controller
  • 13 - Primary video error
  • 14 - Test disabling speed stretch at port 69h
  • 15 - Start refresh timer 1
  • 16 - Enable speed stretch at port 69h
  • 17 - Clear write protect bit
  • 1B - Test 64KB shadow RAM
  • 18 - Write and test interrupt descriptor table
  • 19 - Verify RAM
  • 1A - Check 8042 keyboard controller
  • 20 - Display results of tests to this point
  • 21 - Test DMA controller 1
  • 22 - Test DMA controller 2
  • 23 - Test timer 1 counter 0 840nS clock timer
  • 27 - Test timer 2 counter 0 for NMI
  • 28 - Test timer 2 counter
  • 24 - Initialize both interrupt controllers
  • 25 - Check for unexpected interrupts
  • 26 - Wait for interrupt
  • 30 - Check base 640KB memory
  • 31 - Check extended memory size
  • 32 - Test higher 8 address lines
  • 33 - Test base memory
  • 34 - Test extended memory up to 256MB
  • 35 - Test RAM in segment E000h
  • 40 - Test keyboard enable/disable
  • 41 - Test keyboard reset command
  • 42 - Test keyboard
  • 43 - Test keyboard
  • 45 - Initialize the mouse and enable IRQ 1
  • 44 - Test address overrun capability
  • 50 - Set up hardware interrupt vectors
  • 51 - Enable IRQ 0 interval interrupt from timer 0
  • 60 - Test for floppy and hard disk controllers and drives
  • 61 - Test disk controller
  • 62 - Initialize floppy drives
  • 63 - Initialize hard drives
  • 74 - Check and execute option ROM's from C8000h to DFFFFh
  • 70 - Test RTC
  • 71 - Set interval timer
  • 72 - Configure and test parallel interface
  • 73 - Configure and test serial interface
  • 75 - Test math coprocessor if installed
  • 76 - Enable keyboard and RTC
  • F0 - Display and logged errors
  • F1 - Test system code at E0000h and copy video ROM to shadow memory
  • F2 - Call interrupt 19 boot loader
  • F3 - Got to setup if F1 was pressed
  • F4 - Display speed setting
  • F5 - Initialize counter 2 for speed testing
  • F6 - Test base memory
  • F7 - Test extended memory
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