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

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AT & T BIOS POST Codes

  • 01 - CPU test
  • 02 - System I/O port test
  • 03 - ROM checksum test
  • 05 - DMA page register test
  • 06 - Timer 1 test
  • 07 - Timer 2 test
  • 08 - RAM refresh test
  • 09 - 8/19 bit bus conversion check
  • 0A - Interrupt controller 1 test
  • 0B - Interrupt controller 2 test
  • 0C - Keyboard controller test
  • 0D - CMOS RAM/RTC test
  • 0E - Battery power test
  • 0F - CMOS RAM checksum test
  • 10 - CPU protected mode
  • 11 - Display configuration test
  • 12 - Display controller test
  • 13 - Primary display error
  • 14 - Extended CMOS test
  • 15 - AT bus reset
  • 16 - Initialize chipset registers
  • 17 - Check for extension ROM's
  • 18 - Internal memory address test
  • 19 - Remap memory
  • 1A - Memory interleave mode test
  • 1B - Remap shadow memory
  • 60 - Floppy controller/dr1C - Setup MRAM
  • 1D - Expanded memory test
  • 1E - AT memory error
  • 1F - Internal memory error
  • 20 - Minimum POST tests complete
  • 21 - DMA controller 1 test
  • 22 - DMA controller 2 test
  • 23 - Timer 0 test
  • 24 - Initialize internal controllers
  • 25 - Unexpected interrupt
  • 26 - Expected interrupt
  • 30 - Switch to protected mode
  • 31 - Size AT bus memory or size external memory
  • 32 - Address lines A16 to A23 test
  • 33 - Internal memory test or conventional memory test
  • 34 - AT bus memory test or external memory test
  • 38 - Shadow ROM BIOS to RAM
  • 39 - Shadow extension BIOS to RAM
  • 40 - Enable/disable keyboard
  • 41 - Keyboard clock and data test
  • 42 - Keyboard reset
  • 43 - Keyboard controller test
  • 44 - A20 gate test
  • 50 - Initialize interrupt table
  • 51 - Enable timer interrupt live test
  • 61 - Hard disk controller test
  • 62 - Initialize floppy drives
  • 63 - Initialize hard drives
  • 70 - Real time clock test
  • 71 - Set real time clock
  • 72 - Test parallel interfaces
  • 73 - Test serial interfaces
  • 74 - Check external ROM's
  • 75 - Numeric coprocessor test
  • 76 - Enable keyboard and RTC interrupts (IRQ 9)
  • F0 - Display system startup message
  • F1 - Check for ROM at E000h
  • F2 - Boot from floppy or hard disk
  • F3 - Run setup program
  • F4 - Run password program
  • FC - DRAM type detection
  • FD - CPU register test
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