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IBM PS/2 (Micro Channel) POST Codes

Code

Meaning

00

CPU test; FFAA0055 pattern

01

32 bit CPU register test; setup system timer

02

System ROM checksum

03

Test system enable/system port 94 enable/check

04

Test system POS register; port 102 enable/check

05

Test adapter setup port; POS port 96 enable/check

06

Test RTC/CMOS shutdown byte; Byte 0F CMOS (NMI disable)

07

Test extended CMOS location; ports 74-76 test

08

Test DMA & page register 8 channels; ports 2

09

Initialise DMA command & mode registers

0A

Test refresh (port 61)

0B

Test keyboard controller buffers (8042?aport 61

0C

Keyboard controller self test (8042?aport 60)

0D

Keyboard controller test continuation (8042)

0E

Keyboard self test error indicated (port 64)

0F

Setup system memory configuration

10

Test first 512K RAM in real mode

11

Half system if memory test error

12

Verify LGDT/SGDR LIDT/SIDT (keyboard commands)

13

Initialise PIC #1 (Master)

14

Initialise PIC #2 (Slave)

15

Initialise A20 interrupt vectors

16

Setup extended vector table

17

Check power RTC/CMOS power good signal (byte 0D)

18

Check RTC/CMOS checksum

19

RTC/CMOS lost power (0D 80h)

1A

Skip memory test in protected mode if warm reset

1B

Prepare for shutdown; protected mode initialisation

1C

Setup stack pointer point to the end of first 64K

1D

Decide low memory size in protected mode; Size base memory

1E

Save memory size detected

1F

Setup system memory split address

20

Check for extended memory beyond 64 Mb

21

Test memory address bus lines

22

Clear parity error and channel check; Disable NMI

23

Initialise interrupt 00; system timer

24

Determine CMOS validity

25

Write keyboard controller (8042) command byte

40

Check valid CMOS and video

41

Display error code 160. Check CMOS, AC ripple.

42

Test PIC #1 & PIC #2 registers; Master/Slave test

43

Test PIC #1 & PIC #2 registers with another pattern

44

Check for interrupt with interrupt masked; check for NMI when disabled.

45

Test NMI

46

NMI error detected

47

Test system timer 0

48

Check stuck speaker clock; speaker bitstuck test

49

Test timer 0 count

4A

Test timer 2 output

4B

Check if timer interrupt occurred

4C

Test timer 0 for count too fast or slow

4D

Verify timer 0 interrupt

4E

Check 8042 ready for command; buffer free

4F

Check for soft reset

50

Prepare for shutdown/protected mode

51

Start protected mode test

52

Test memory in 64K increments

53

Check if memory test done

54

Shutdown system and return to real mode

55

Test for manufacture or regular test; test for loop. Check jumper.

56

Disable keyboard

57

Check for keyboard self test

58

Keyboard test passed; check for errors

59

Test keyboard interface

5A

Initialise mouse

5B

Disable mouse

5C

Initialise interrupt vectors

5D

Initialise interrupt vectors

5E

Initialise interrupt vectors

5F

BIOS data area

60

Determine diskette rate

61

Reset floppy controller/drive

62

Floppy drive test

63

Turn floppy motor off

64

Serial port setup

65

Enable/test RTC interrupt

66

Configure floppy drives

67

Configure hard drive

68

Enable system CPU arbitration; wait states

69

Scan for optional ROMs

6A

Verify serial and parallel ports

6B

Setup equipment byte

6C

Setup configuration errors reported

6D

Set keyboard typematic rate

6E

Reset page register; boot up system (Int 19 bootloader)

70

Reset disk

71

Read bootcode for E6/E9

72

Control to bootcode

73

Bootcode/ROM Basic

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