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Zenith 191 BIOS - 1992

Code

Meaning

0

Start of Slush Test

1

Processor Test

2

CACHE and CLIO

3

ISP Defaults Set

4

Into Protected Mode

5

Memory SIMMs Count

6

Memory Controller

7

Preped to Test Block

8

First 1Mb of Ram

9

Checksum OEM ROM

10

Low Flash ROM Checks

11

F000 ROM Checks

12

Aurora VIDEO ROM

13

F000 ROM Slushed

14

Sep Initialized

15

Language Slushed

16

Do VIDEO Specific tests

17

Done Slushing

32

Point Interrupt Vectors

33

Turn on Parity Generation

34

Initialize System Variables

35

Init Interrupt Controllers

36

Check Error that Occurred

37

Reinitialize SCP Warm Boot

38

Test CMOS Diag, Power, Reset

39

Reserved, or DDNIL status flag check

3A

Test CPU Reset (80386)

3B

Save the CPU ID in GS

3C

Slush Video ROM to C0000

3D

Init the Video and Timers

3E

Init CMA Ports, Clear Page

3F

Set Speed too Fast for now

40

Checksum the Nonvolatile RAM

41

Initialize Configuration

42

Init Expansion Boards from VRAM

43

Turn Cache off for Memory Test

44

Init Memory Ctrlr, test Extd Memory

45

Test Base RAM

46

Determine amount of System RAM

47

Test and Init Cache if installed

48

Test System Timer Tick

49

Initialize the Write queues

4A

Initialize Monitor RAM

4B

Clear 16K of Base RAM

4C

Install BIOS Interrupt Vectors

4D

Enable Default Hardware Initialization

4E

Determine Global I/O configuration

4F

Reserved

50

Initialize Video

51

Init WD90C30 Scratchpad register

52

Initialise the keyboard processor

53

Turn off IRQ 12 if mouse is off

54

Wait for user to enter correct password

55

Init System Clock Time of Day

56

Test, Init Floppy System, Track Seeks

57

Init Winchester subsystem, Messages

58

Install ROMs starting at C80000H

59

Install ROM starting at E0000H

5A

Initialise SCSI interface

5B

Set default I/O Device Parameters

5C

Init the cache speed and clock

5D

Always tell System ROM 'Cold

5E

Run with A20 off in PC Mode

5F

Really turn off the SCP

60

Set machine speed using CFG

61

Turn on cache if machine halt

62

Calibrate 1ms constants

63

Enable NMI

64

Test for errors before boot

65

Boot

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