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

Home | Products | View Cart | Contact Us

AT&T XT 8088/86 BIOS v3.1 BIOS Post Codes

  • 01 - Processor test 1
  • 02 - Determine type of POST test
  • 06 - Initialize 8259 programmable interrupt controller and 8237 DMA controller chips
  • 07 - Processor test #2
  • 09 - EPROM checksum for 32KB
  • 0A - Initialize video controller 6845 registers
  • 15 - Test 1st 64K of system memory
  • 16 - Setup interrupt vector table in 1st 64K
  • 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
  • 1D - Setup configuration byte from 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 interrupt functionality
  • 2A - Initialize keyboard
  • 2B - Initialize floppy controller and drive
  • 2C - Initialize COM ports
  • 2D - Initialize LPT ports
  • 2F - Initialize coprocessor
  • 31 - Initialize option ROM's
  • FF - Interrupt 19 boot loader
Home | Products | Contact Us | View Cart | © 2012 Microsystems Development Tech. Inc.