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