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Arche Technologies Legacy BIOS
Derives from AMI (9 April 90), using port 80; certain codes come up if a copy is made without AMI's copyright notice. The major differen -ces are at the end.

Code

Explanation

01

Disable NMI and test CPU registers

02

Verify ROM BIOS checksum (32K at F800:0)

03

Initial keyboard controller and CMOS RAM communication

04

Disable DMA and interrupt controllers; test CMOS RAM interrupt

05

Reset Video

06

Test 8254 timer

07

Test delta count for timer channel 2 (speaker)

08

Test delta count for timer channel 1 (memory refresh)

09

Test delta count for timer channel 0 (system timer)

0A

Test parity circuit and turn on refresh

0B

Enable parity check circuit and test system timer

0C

Test refresh trace link toggle

0D

Test refresh timing synchronization of high and low period

10

Disable cache and shadow BIOS; test 64K base memory address lines

11

Test base 64K memory for random addresses and data read/write

12

Initialize interrupt vectors in lower 1K of RAM

14

Test CMOS RAM shutdown register read/write; disable DMA and interrupt controllers

15

Test CMOS RAM battery and checksum, and different options such as diagnostic byte

16

Test floppy information in CMOS RAM; initialize monochrome video

17

Initialise colour video

18

Clear parity status if any

19

Test for EGA/VGA video ROM BIOS at C000:0 and pass control to it if there

1A

Returned from video ROM. Clear parity status if any; update system parameters for any video ROM found; test display memory read/write

1B

Primary video adapter: check vertical and horizontal retrace; write/read test video memory

1C

Secondary video adapter: check vertical and horizontal retrace; write/read test video memory

1D

Compare and verify CMOS RAM video type with switches and actual video adapter; set equipment byte if correct

1E

Call BIOS to set mono/colour video mode according to CMOS RAM

20

Display CMOS RAM write/read errors and halt if any

21

Set cursor to next line and call INT 10 to display

22

Display Power on "386 BIOS" message and check CPU speed is 25 or 33 MHz

23

Read new cursor position and call INT 10 to display

24

Skip 2 rows of text and display (C)AMI at bottom of screen

25

Refresh is off, so call shadow RAM test

F0

Failure inside shadow RAM test

30

Verify (C)AMI... and overwrite with blanks before entering protected mode

31

Enter protected mode and enable timer interrupt (IRQ0). Errors here indicate gate A20 circuit failed

32

Size memory above 1Mb

33

Size memory below 640K

34

Test memory above 1Mb

35

Test memory below 1Mb

36

Unknown AMI function

37

Clear memory below 1Mb

38

Clear memory above 1Mb

39

Set CMOS shutdown byte to 3 and go back to real mode

3A

Test sequential and random data write/read of base 64K RAM

3B

Test RAM below 1Mb and display area being tested

3C

Test RAM above 1Mb and display area being tested

3D

RAM test OK

3E

Shutdown for return to real mode

3F

Back in real mode; restore all variables

40

Disable gate A20 since now in real mode

41

Check for (C)AMI in ROM

42

Display (C)AMI message

43

Clear <Esc> message; test cache

4E

Process shutdown 1; go back to real mode

4F

Restore interrupt vectors and global data in BIOS RAM area

50

Test 8237 DMA controller and verify (c)AMI in ROM

51

Initialize DMA controller

52

Test various patterns to DMA controller

53

Verify (C)AMI in ROM

54

Test DMA control flip-flop

55

Initialize and enable DMA controllers 1 and 2

56

Initialize 8259 interrupt controllers?aclear write request and mask registers

57

Test 8259 controllers and setup interrupt mask registers

61

Check DDNIL status bit and display message if clear

70

Perform keyboard BAT (Basic Assurance Test)

71

Program keyboard to AT type

72

Disable keyboard and initialize keyboard circular buffer

73

Display "DEL" message for setup prompt and initialize floppy controller/drive

74

Attempt to access floppy drive

75

If CMOS RAM is good, check and initialize hard disk type identified in CMOS RAM

76

Attempt to access hard disk and set up hard disk

77

Shuffle any internal error codes

78

Verify (C)AMI is in ROM

79

Check CMOS RAM battery and checksum; clear parity status

7A

Compare size of base/extended memory to CMOS RAM info

7B

Unknown AMI function

7C

Display (C)AMI

7D

Set/reset AT compatible memory expansion bit

7E

Verify (C)AMI is in ROM

7F

Clear <DEL> message from screen and check if DEL pressed

80

Find option ROM in C800 to DE00 and pass control to any found

81

Return from adapter ROM; initialize timer and data area

82

Setup parallel and serial port base info in global data area

83

Test for presence of 80387 numeric coprocessor and initialize

84

Check lock key for keyboard

85

Display soft error messages if any CMOS RAM data error was detected such as battery or checksum

86

Test for option ROM in E000:0 and pass control to any found

A0

Error in 256 Kbit or 1Mbit RAM chip in lower 640K memory

A1

Base 64K random address/data pattern test (only in 386APR and Presto 386SX BIOS)

A9

Initialize on-board VGA (Presto 386SX)

B0

Error in 256 Kbit RAM chip in lower 640K memory

B1

Base 64K random address/data pattern test (only in Presto 386SX BIOS)

E0

Returned to real mode; initialise base 64K RAM (Presto)

E1

initialize base 640K RAM (Presto)

EF

Configuration memory error in Presto -can't find memory

F0

Test shadow RAM from 0:4000 RAM area

00

Call INT 19 boot loader

BACK

 

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