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