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Phoenix BIOS Plus or v1.0 POST/Beep Codes
Only for BIOS PLUS or A286/A386/A486 Version 1.xx on an AT-class (80286 or higher) systems. Codes in the 50h range or beyond are chipset or custom platform specific, and will vary from system to system.

Code

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.

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(10) 1st 64K RAM failure.

1B

2-3-2

Bit B(11) 1st 64K RAM failure.

1C

2-4-2

Bit C(12) 1st 64K RAM failure.

1D

2-4-2

Bit D(13) 1st 64K RAM failure.

1E

2-4-3

Bit E(14) 1st 64K RAM failure.

1F

2-4-4

Bit F(15) 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

8042 keyboard controller test failure.

28

none

CMOS power failure/checksum calculation in progress.

29

none

CMOS 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.

34

4-2-1

Timer tick interrupt test in progress or failed (non-fatal).

35

4-2-2

Shutdown failure (non-fatal).

36

4-2-3

Gate A20 failure (non-fatal).

37

4-2-4

Unexpected interrupt in protected mode (non-fatal).

38

4-3-1

Mem high address line fail at 01000-0A000 (non-fatal).

39

4-3-2

Mem high addr line fail at 100000-FFFFFF (non-fatal).

3A

4-3-3

Timer chip counter 2 failed (non-fatal).

3B

4-3-4

Time-of-day clock stopped

3C

4-4-1

Serial port test

3D

4-4-2

Parallel port test

3E

4-4-3

Maths coprocessor test

41

low 1-1-2

System board select bad

42

low 1-1-3

Extended CMOS RAM bad

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