Source: Internet, primary source unknown. Edited by Tomáš Slavotínek.
| CP | Description |
|---|
| 00? | CPU tested with pattern FFAA0055 |
| 01 | CPU 32 register tested |
| 02 | BIOS ROM checksum tested |
| 03 | System port 94 enabled and checked |
| 04 | POS registers port 102 enabled and checked |
| 05 | POS registers port 96 enabled and tested |
| 06 | CMOS shutdown byte 0F tested (CMOS rolling bit test) |
| 07 | CMOS extended port 74-76 enabled and tested (NVRAM rolling bit test) |
| 08 | DMA and page registers tested (ports 2, 18, 1A and 1C) |
| 09 | DMA initialized |
| 0A | Memory refresh tested |
| 0B | 8042 keyboard controller buffers tested (ports 61 and 64) |
| 0C | 8042 keyboard controller internal test (port 60) |
| 0D | 8042 keyboard controller internal test continued |
| 0E | 8042 keyboard controller self test error |
| 0F | Memory sized and setup |
| 10 | First 512K base memory tested |
| 11 | Base memory error, system halted |
| 12 | Protected mode instructions tested; Keyboard commands tested |
| 13 | PIC Interrupt controller 1 (master) tested |
| 14 | PIC Interrupt controller 2 (slave) tested |
| 15 | Initialize 120 Interrupt vectors |
| 16 | Initialize 16 extended vectors |
| 17 | CMOS/RTC tested; CMOS byte 0D tested |
| 18 | CMOS/RTC checksum tested |
| 19 | CMOS/RTC battery tested |
| 1A | Check for soft or hard reset |
| 1B | Protected mode initialization |
| 1C | Protected mode stack set; Pointer to end of first 64K set |
| 1D | Low memory size tested in protected mode |
| 1E | Memory size information saved |
| 1F | Memory split address setup |
| 20 | Check for extended memory beyond 64MB |
| 21 | Test memory-address bus lines |
| 22 | Clear parity error and channel lock |
| 23 | Initialize interrupt 0 |
| 24 | Check CMOS RAM validity |
| 25 | Write keyboard-controller command byte |
| 40 | Check valid CMOS RAM and video system |
| 41 | Display error code 160 |
| 42 | Test registers in both interrupt controllers |
| 43 | Test interrupt controller registers |
| 44 | Test interrupt mask registers |
| 45 | Test NMI |
| 46 | NMI error has been detected |
| 47 | Test system timer 0 |
| 48 | Check system speaker clock |
| 49 | Test system timer 0 count |
| 4A | Test system timer 1 count |
| 4B | Check if timer interrupt occurred |
| 4C | Test timer 0 for improper operation (too fast or too slow) |
| 4D | Verify timer interrupt 0 |
| 4E | Check 8042 keyboard controller |
| 4F | Check for soft reset |
| 50 | Prepare for shutdown |
| 51 | Start protected mode test |
| 52 | Test memory in 64KB increments |
| 53 | Check if memory test done |
| 54 | Return to real mode |
| 55 | Test for regular or manufacturing mode |
| 56 | Disable the keyboard |
| 57 | Check for keyboard self test |
| 58 | Keyboard test passed |
| 59 | Test the keyboard controller |
| 5A | Configure the mouse |
| 5B | Disable the mouse |
| 5C | Initialize interrupt vectors |
| 5D | Initialize interrupt vectors |
| 5E | Initialize interrupt vectors |
| 60 | Save DDNIL status |
| 61 | Reset floppy drive |
| 62 | Test floppy drive |
| 63 | Turn floppy-drive motor off |
| 64 | Set up serial ports |
| 65 | Enable real time clock interrupt |
| 66 | Configure floppy drives |
| 67 | Configure hard drives |
| 68 | Enable system CPU arbitration |
| 69 | Scan for adapter ROMs |
| 6A | Verify serial and parallel ports |
| 6B | Set up equipment byte |
| 6C | Set up configuration |
| 6D | Set keyboard-typematic rate |
| 6E | Call Int. 19 boot loader |