| 01 | Disable the NMI and test CPU registers |
| 02 | Verify the BIOS ROM checksum (32KB at F8000h) |
| 03 | Initialize the keyboard controller and CMOS RAM communication |
| 04 | Disable the DMA and PIT; test the CMOS RAM interrupt |
| 05 | Reset the video controller |
| 06 | Test the 8254 programmable interrupt timer |
| 07 | Test delta count timer channel 2 (speaker) |
| 08 | Test delta count timer channel 1 (memory refresh) |
| 09 | Test delta count timer channel 0 (system timer) |
| 0A | Test parity circuit and turn on refresh |
| 0B | Enable parity check and test system timer |
| 0C | Test refresh trace link toggle |
| 0D | Test refresh timing synchronization |
| 10 | Disable cache and shadow memory; test the 64KB base memory |
| 11 | Perform 64KB memory read/write test |
| 12 | Initialize interrupt vector table in lower 1KB of RAM |
| 14 | Test CMOS RAM shutdown register...disable DMA and interrupt controllers |
| 15 | Test CMOS RAM battery and checksum |
| 16 | Test for floppy drive, based on CMOS setup...initialize monochrome video |
| 17 | Initialize CGA video |
| 18 | Clear the parity status (if any) |
| 19 | Test for EGA/VGA video BIOS at C0000h and pass control |
| 1A | Return from video ROM |
| 1B | Test primary video adapter...test video memory |
| 1C | Test secondary video adapter...test video memory |
| 1D | Compare CMOS settings to video adapter |
| 1E | Set video mode according to CMOS settings |
| 20 | Display CMOS RAM read/write errors and halt |
| 21 | Set cursor and call interrupt 10 to display status message |
| 22 | Display power on message; "386 BIOS"; check if CPU speed is 25Mhz or 33Mhz |
| 23 | Read new cursor position |
| 24 | Display AMI copyright message at the bottom of the screen |
| 25 | Test shadow RAM |
| F0 | Shadow RAM test failed |
| 30 | Ready to enter protected mode |
| 31 | Enter protected mode (A20 gate) and enable timer interrupt (IRQ 0) |
| 32 | Get memory size above 1MB |
| 33 | Get memory size below 640KB |
| 34 | Test memory above 1MB |
| 35 | Test memory below 1MB |
| 37 | Clear memory below 1MB |
| 38 | Clear memory above 1MB |
| 39 | Use CMOS shutdown byte and return to real mode |
| 3A | Test 64KB read/write |
| 3B | Test RAM below 1MB and show the area being tested |
| 3C | Test RAM above 1MB and show the area being tested |
| 3D | RAM test complete OK |
| 3E | Ready to return to real mode |
| 3F | Back in real mode |
| 40 | Disable A20 gate |
| 41 | Check for AMI copyright message in ROM |
| 42 | Display the AMI copyright message, if found |
| 43 | Test cache memory; Clear <Esc> message |
| 4E | Process shutdown 1; Return to real mode |
| 4F | Restore interrupt vectors and data in BIOS RAM area |
| 50 | Test DMA controller |
| 51 | Initialize DMA controller |
| 52 | Test the DMA controller with patterns |
| 54 | Test DMA controller latches |
| 55 | Initialize and enable DMA controllers 1 and 2 |
| 56 | Initialize 8259 programmable interrupt controllers |
| 57 | Test 8259 programmable interrupt controllers and setup interrupt mask registers |
| 61 | Check DDNIL status bit and display message |
| 70 | Perform keyboard (BAT) basic assurance test |
| 71 | Program keyboard to AT type |
| 72 | Disable keyboard and initialize keyboard circular buffer |
| 73 | Display message and initialize floppy controller and drive |
| 74 | Attempt to access the floppy drive |
| 75 | If the CMOS RAM is good, check and initialize the hard disk controller and drive |
| 76 | Attempt to access the hard disk drive |
| 77 | Shuffle and internal error codes |
| 79 | Check CMOS RAM battery and checksum...clear parity status |
| 7A | Compare size of base/extended memory to CMOS information |
| 7B | Unknown AMI function |
| 7C | Display AMI copyright |
| 7D | Set AT memory expansion bit |
| 7E | Verify the ROM contains and AMI copyright |
| 7F | Clear the <Del> message from the display...check if <Del> was pressed |
| 80 | Locate option ROM at C800h to DE00h and pass control to any found |
| 81 | Return from option ROM and initialize timer and data area |
| 82 | Setup parallel and serial ports |
| 83 | Test for math coprocessor |
| 84 | Check if keyboard is locked |
| 85 | Display any soft error messages |
| 86 | Test for option ROM at E0000h |
| A0 | Error found in 256KB or 1MB RAM IC in lower 640KB |
| A1 | Base 64KB random access and data pattern test (only in 386APR and Presto 386SX BIOS) |
| A9 | Initialize on board VGA controller (Presto 386SX BIOS) |
| B0 | Error in 256KB RAM IC in 640KB |
| B1 | Base 64KB random access and data pattern test (only in Presto 386SX BIOS) |
| E0 | Return to real mode and initialize base 64KB RAM (Presto) |
| E1 | Initialize 640KB RAM (Presto) |
| EF | Configuration memory error - can't find memory |
| F0 | Test shadow RAM from 04000h |
| 00 | Call the interrupt 19 boot loader |