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PHILIPS BIOS Post Codes

  • 02 - Speaker Initialization
  • 03 - Sign on with a Beep
  • 04 - Prepare Speaker for Error Tone Frequency
  • 05 - Make Sure Real Time Clock/Calendar (RTC) Doesn't Interrupt
  • 06 - Reset Video Controllers
  • 07 - Disable Parity and I/O Check Circuits
  • 08 - Start of Dynamic RAM Refresh Program Channel 1 of Timer A
  • 0A - Test DMA Page Registers
  • 10 - Test and Clear the Shutdown Status Byte Hex OF in CMOS
  • 11 - Rom Checksum Test
  • 12 - Timer Test
  • 13 - Initialize and Test 8237 DMA A
  • 14 - Initialize and Test 8237 DMA B
  • 15 - Refresh Test (Obsolete)
  • 16 - Flush the 8042 Keyboard Controller
  • 17 - Reset the 8042 Keyboard Controller
  • 18 - Store Keyboard Switch Setting to DMA Page Register
  • 19 - Initialize the 8042 Keyboard Controller
  • 1A - Prepare for RAM Tests
  • 1B - Enable RAM Parity Check
  • 1C - Test Base 64K of RAM in Real Mode
  • 1D - Check for Pending Parity Error
  • 1E - Setup RAM Stack for POD Tests
  • 1F - Enable RAM Parity Check
  • 20 - Store Keyboard Switch Settings into RAM
  • 21 - Test 286 Protected Mode Registers
  • 22 - Initialize Co-Processor Master and Slave 8259's
  • 23 - Fill Interrupt Vetctors with Seg:Offset to Temporary Interrupt
  • 24 - Setup BIOS Interrups Vectors
  • 25 - Check CMOS Battery Status and Checksum
  • 26 - Adjust Equipment Config if Conflict Between CMOS and Video Switches
  • 27 - Check if POD is in Looping Mode
  • 28 - Initialize Video Controller
  • 2B - Test Video Hardware
  • 2C - Install Video
  • 2D - Adjust Video Configuration
  • 2E - Adjust Video Configuration
  • 2F - Initialize Video Controller
  • 30 - Swap Special Video Interrupt Offset for Protected Mode
  • 31 - Check if Errors were Previously Detected and Print Messages
  • 32 - Test Both Base Memory Size and Extended Memory Sizes in Protected Mode
  • 33 - Set CMOS Flag if Configuration and Tested Memory Sizes Differ
  • 34 - Enable Parity and I/O Check Circuits
  • 35 - Test 8259 Controller (Obsolete)
  • 36 - Test_Bswap
  • 37 - Test_NMI
  • 38 - Test_Timerint
  • 39 - Startup System Timer 8254 A Channel 0
  • 3A - Enter Protected Mode Test RAM Above First 64K
  • 3B - Determine Keyboard Type
  • 3C - Test Keyboard Interrupt
  • 3D - Switch Address Bit 20 Out for Real Mode Operation
  • 3E - Hard Reset to Hard Disk Controller if Soft Reset
  • 3F - Set Floppy Data Rate to 250Kb/Sec and Enable Diskette Interrupts
  • 40 - Reset Floppy Disk and See if Error
  • 41 - Setup Keyboard Pointers and Parameters
  • 42 - Enable System Timer Interrupts
  • 43 - Set Flag if Dual (Floppy/HD) Controller Card
  • 44 - Preliminary Check to Determine Type of Drives
  • 45 - Check for a Second Floppy Drive
  • 46 - Activate Hard Disk
  • 47 - Program DMA B Channel 0 to Enable DMA A
  • 48 - Check for ROM Code Sitting in Segmets C800h to E000h in 2K Blocks
  • 49 - Check for Printers Update Printer Base Table and Equip_Flag
  • 4A - Check for Serial Devices Update RS232 Base and Equip_Flag
  • 4B - Setup 80287 Co-Processor Hardware if Installed
  • 4C - Read CMOS Diagnostic Byte
  • 4D - Check Configuration Information
  • 4E - Copy Real-Time-Clock Time into Timer Tic Counters
  • 4F - Enable Interrupt (Slave 8259 IRQ1)
  • 51 - Check for and Call Add-On ROM at Segment 0E000
  • 52 - Enable Keyboard Interrupts
  • 53 - Initialize Printer Port #0 for AT Compatibility
  • 60 - If POD Error Print Message and Wait for F1 Key if not Keyboard Error
  • 62 - Print Sign on Message
  • 63 - Set Video Interrupt Vector Back to What It Was
  • 64 - Boot Start
  • 65 - Convert Switch 3 (Slow/Fast Video) to Bit in CMOS
  • 66 - Print Manufacturing Message if Switch Indicates So
  • 67 - Send READ ID Command to the 8042 Keyboard Controller
  • 69 - Determine Chipset Configuration if Not AT Compatible
  • 6A - VIDEO-SYSTEM Shadowing
  • 6B - Determine What Type of Memory Chips are Installed
  • 6D - Determine if User is Shadowing or Wants Remap (Neat Type)
  • 6E - Determine Total Memory and Write it to CMOS (Neat Type)
  • 6F - Set EMS Memory According to CMOS
  • 70 - Check Memory Configuration
  • 71 - Calculate Checksum for CMOS 60-6E
  • 72 - Initialize Video Speed According to CMOS
  • 73 - Check the Execution Speed of the CPU Against the Timer Clock
  • 74 - Size and Enable the Cache
  • 75 - Set Auto Repeat Speed for Keyboard
  • 76 - Process the System Startup Options
  • 77 - Calculate the Checksum of BIOS Reserved CMOS Area
  • 78 - Set the BOOT Speed According to Configuration
  • 79 - Reinitialize the Speaker
  • 7A - Disables E000 VGA if not Required
  • 7B - Set Initial Video Emulation Depending on Value in CMOS
  • 7C - Check if a Key is in the Keyboard Buffer
  • 7D - Check Dip Switch to See if on Board Video BIOS Must be Selected
  • 7E - Setup Boot Speed
  • 7F - Determine if Machine Will Boot in Either Master or User Mode
  • 81 - Initialize the OMS Output Redirection if Specified
  • 82 - Start of Dynamic RAM Refresh Program Channel 1 of Timer A
  • 83 - Set Machine Type in CMOS
  • 84 - Parity Test (Configuration) and Set
  • 85 - Determine if 286, 386SX or 486SX
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