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TBVS 2.0 BIOS Post Codes

  • 02 - Flag Test
  • 04 - Register Test
  • 06 - System Hardware Initialization
  • 08 - Initialize Chip Set Registers
  • 0A - BIOS ROM Checksum
  • 0C - DMA Page Register Test
  • 0E - 8254 Timer Test
  • 10 - 8254 Timer Initialization
  • 12 - 8237 DMA Controller Test
  • 14 - 8237 DMA Initialization
  • 16 - Initialize 8259/Reset Coprocessor
  • 18 - 8259 Interrupt Controller Test
  • 1A - Memory Refresh Test
  • 1C - Base 64KB Address Test
  • 1E - Base 64KB Memory Test
  • 20 - Base 64KB Test (Upper 16 bits)
  • 22 - 8742 Keyboard Self Test
  • 24 - MC146818 CMOS Test
  • 26 - Start First Protected Mode Test
  • 28 - Memory Sizing Test
  • 2A - Autosize Memory Chips
  • 2C - Chip Interleave Enable Test
  • 2E - First Protected Mode Test Exit
  • 30 - Unexpected Shutdown
  • 32 - System Board Memory Size
  • 34 - Relocate Shadow Ram if Configured
  • 36 - Configure EMS System
  • 38 - Configure Wait States
  • 3A - ReTest 64K Base RAM
  • 3C - CPU Speed Calculation
  • 3E - Get Switches From 8042
  • 40 - Configure CPU Speed
  • 42 - Initialize Interrupt Vectors
  • 44 - Verify Video Configuration
  • 46 - Initialize Video System
  • 48 - Test Unexpected Interrupts
  • 4A - Start Second Protected Mode Test
  • 4C - Verify LDT Instruction
  • 4E - Verify TR Instruction
  • 50 - Verify LSL Instruction
  • 52 - Verify LAR Instruction
  • 54 - Verify VERR Instruction
  • 56 - Unexpected Exception
  • 58 - Address Line 20 Test
  • 5A - Keyboard Ready Test
  • 5C - Determine AT or XT Keyboard
  • 5E - Start Third Protected Mode Test
  • 60 - Base Memory Test
  • 62 - Base Memory Address Test
  • 64 - Shadow Memory Test
  • 66 - Extended Memory Test
  • 68 - Extended Address Test
  • 6A - Determine Memory Size
  • 6C - Display Error Messages
  • 6E - Copy BIOS to Shadow Memory
  • 70 - 8254 Clock Test
  • 72 - MC146818 Real Time Clock Test
  • 74 - Keyboard Stuck Key Test
  • 76 - Initialize Hardware Interrupt Vectors
  • 78 - Math Coprocessor Test
  • 7A - Determine COM Ports Available
  • 7C - Determine LPT Ports Available
  • 7E - Initialize BIOS Data Area
  • 80 - Determine Floppy/Fixed Controller
  • 82 - Floppy Disk Test
  • 84 - Fixed Disk Test
  • 86 - External ROM Scan
  • 88 - System Key Lock Test
  • 8A - Wait for F1 Key Pressed
  • 8C - Final System Initialization
  • 8E - Interrupt 19 Boot Loader
  • B0 - Unexpected Interrupt
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