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AT&T v3.00 - 3.03 8/26/87 286 N3.03 Extensions BIOS Post Codes

  • 01 - Processor test #1
  • 02 - Determine type of POST test
  • 03 - Clear 8042 keyboard controller interface
  • 04 - Reset 8042 keyboard controller interface
  • 05 - Get 8042 keyboard controller manufacturing status
  • 06 - Initialize LSI onboard chips
  • 07 - Processor test #2
  • 08 - Initialize CMOS chip
  • 09 - EPROM checksum for 32KB
  • 0A - Initialize video interface
  • 0B - Test 8254 programmable interrupt timer channel 0
  • 0C - Test 8254 programmable interrupt timer channel 1
  • 0D - Test 8254 programmable interrupt timer channel 2
  • 0E - Test CMOS date and timer
  • 0F - Test CMOS shutdown byte
  • 10 - Test DMA channel 0
  • 11 - Test DMA channel 1
  • 12 - Test DMA page registers
  • 13 - Test 8741 keyboard controller
  • 14 - Test memory refresh toggle circuits
  • 15 - Test 1st 64KB of system memory
  • 16 - Setup interrupt vector table
  • 17 - Setup video I/O operations
  • 18 - Test video memory
  • 19 - Test 8259 programmable interrupt controller channel 1 mask bits
  • 1A - Test 8259 programmable interrupt controller channel 2 mask bits
  • 1B - Test CMOS battery level
  • 1C - Test CMOS checksum
  • 1D - Setup configuration byte for CMOS
  • 1E - Sizing system memory & compare with CMOS
  • 1F - Test found system memory
  • 20 - Test stuck 8259's interrupt bits
  • 21 - Test stuck NMI bits
  • 22 - Test 8259 programmable interrupt controller functionality
  • 23 - Test protected mode and A20 gate
  • 24 - Sizing extended memory above 1MB
  • 25 - Test found system/extended memory
  • 26 - Test exceptions in protected mode
  • 2A - POST_KEYBOARD
  • 2B - POST_FLOPPY
  • 2C - POST_COMM
  • 2D - POST_PRN
  • 2E - POST_DISK
  • 2F - POST_MATH
  • 30 - POST_EXCEPTION
  • CC - POST_NMI
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