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Code

Meaning

03

1 short beep when first awake

04

Initialize bell tone

05

Enable CMOS RAM

06

Reset video controller

07

Disable I/O parity

08

Start memory refresh

09

Clear reset flag in RAM

0A

Test DMA page registers

10

Use CMOS to determine if soft reset

11

Perform ROM checksum

12

Test timer A

13

Test DMA channel A

14

Test DMA channel B

15

Test refresh

16

Flush 8042 input buffer

17

Reset 8042

18

Get keyboard switch

19

Initialise keyboard

1A

Clear any existing parity

1B

Enable on-board parity

1C

Test base 64K memory

1D

Test base 64k parity

1E

Initialize POST stack

20

Put keyboard # in RAM

65

Set video speed

21

Test protected mode registers

22

Initialize 8259 interrupts

23

Zero all 256 interrupts

24

Initialize interrupts 0-1fh

25

Perform DRAM checksum

26

Adjust configuration based on hardware found

27

Check manufacturing switch (may exit POST)

28

Initialize video controller

2A

Test video memory

2B

Test video sync

2C

Look for external video

2D

Change video configuration if external video

2E

Unused

2F

Initialize video controller

30

Change video interrupt

31

Print any POST messages

32

Size memory by testing it

33

Adjust memory configuration

33

Verify CMOS RAM size

34

Enable I/O parity

35

Test 8259

36

Bytes swap test

37

Test NMI

38

Timer test

39

Initialize timer A

3A

Protected mode memory test

3B

Test keyboard

3C

Test keyboard interrupt

3D

Enable A20

3E

Reset hard disk controller

3F

Setup floppy controller

40

Test floppies

41

Setup keyboard (NUMLOCK)

42

Enable timer interrupt

43

Check for dual floppy/hard disk controller

44

Find floppy drive A type

45

Find floppy drive B type

46

Reset hard disk

47

Enable slave DMA

63

Set video interrupt vector

48

Call any external ROMs

49

Initialize printer

4A

Initialize serial

4B

Initialize 80287

4C

Read CMOS RAM status

4D

Check CMOS configuration against hardware found

70

Check CMOS configuration against memory found

4E

Initialize timer ticks

4F

Enable IRQ9

50

Enable on-board parity

51

Call add-on card ROM

52

Enable keyboard interrupt

53

Reset printer

60

Check for any errors

61

One short beep

62

Print sign-on message

64

Perform boot

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