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Phoenix ISA/EISA/MCA BIOS POST/Beep Codes (fatal)

Msg

Beeps

Meaning

01

none

CPU register test in progress.

02

1-1-3

CMOS write/read failure.

03

1-1-4

ROM BIOS Checksum Failure.

04

1-2-1

Programmable interval timer failure.

05

1-2-2

DMA Initialisation failure.

06

1-2-3

DMA page register write/read failure.

08

1-3-1

RAM refresh verification failure.

09

none

1st 64K RAM test in progress.

0A

1-3-3

1st 64K RAM chip or data line failure multi-bit.

0B

1-3-4

1st RAM odd/even logic failure.

0C

1-4-1

Address line failure 1st 64K RAM.

0D

1-4-2

Parity failure 1st 64K RAM.

0E

1-4-3

Fail-safe timer failure.

0F

1-4-4

Software NMI port failure.

10

2-1-1

Bit 0 1st 64K RAM failure.

11

2-1-2

Bit 1 1st 64K RAM failure.

12

2-1-3

Bit 2 1st 64K RAM failure.

13

2-1-4

Bit 3 1st 64K RAM failure.

14

2-2-1

Bit 4 1st 64K RAM failure.

15

2-2-2

Bit 5 1st 64K RAM failure.

16

2-2-3

Bit 6 1st 64K RAM failure.

17

2-2-4

Bit 7 1st 64K RAM failure.

18

2-3-1

Bit 8 1st 64K RAM failure.

19

2-3-2

Bit 9 1st 64K RAM failure.

1A

2-3-3

Bit A 1st 64K RAM failure.

1B

2-3-2

Bit B 1st 64K RAM failure.

1C

2-4-2

Bit C 1st 64K RAM failure.

1D

2-4-2

Bit D 1st 64K RAM failure.

1E

2-4-3

Bit E 1st 64K RAM failure.

1F

2-4-4

Bit F 1st 64K RAM failure.

20

3-1-1

Slave DMA register failure.

21

3-1-2

Master DMA register failure.

22

3-1-3

Master interrupt mask register failure.

23

3-1-4

Slave interrupt mask register failure.

25

none

Interrupt vector loading in progress.

27

3-2-4

Keyboard controller test failure.

28

none

CMOS pwr failure; checksum calculation in progress.

29

none

CMOS RAM configuration validation in progress.

2B

3-3-4

Screen memory test failure.

2C

3-4-1

Screen initialisation failure.

2D

3-4-2

Screen retrace test failure.

2E

none

Search for video ROM in progress.

30

none

Screen believed running with video ROM.

31

none

Mono monitor believed operable.

32

none

Colour monitor (40 col) believed operable.

33

none

Colour monitor (80 col) believed operable.

ISA/EISA/MCA BIOS POST/Beep Codes (non-fatal)
Non-fatal if manufacturing jumper is on.

Msg

Beeps

Meaning

34

4-2-1

No time tick.

35

4-2-2

Shutdown test in progress or failure.

36

4-2-3

Gate A20 failure.

37

4-2-4

Unexpected interrupt in protected mode.

38

4-3-1

Memory high address line failure at 01000-0A000. Also RAM test in progress or address failure >FFFH.

39

4-3-2

Memory high address line failure at 100000-FFFFFF.

3A

4-3-3

Interval Timer channel 2 test or failure.

3B

4-3-4

Time-of-day clock test or failure.

3C

4-4-1

Serial port test or failure.

3D

4-4-2

Parallel port test or failure.

3E

4-4-3

Maths coprocessor test

3F

Cache test (Dell)

41

low 1-1-2

System board select bad (Micro Channel only)

42

low 1-1-3

Extended CMOS RAM bad (Micro Channel only)

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