PORT 80 CODES (continued)
The System BIOS gives control to the different Buses at the following
checkpoints to do various tasks on the different Buses.
Code
Description
2A
Different Buses init (system, static, output devices)
38
Different Buses init (input, IPL, general devices)
39
Display different Buses initialization error messages
95
Init of different Buses optional ROM’s from C800
While control is inside the different Bus routines, additional checkpoints are
output to Port 80H as WORD to identify the routines under execution.
These are WORD checkpoints. The LOW BYTE of checkpoint is the sys-
tem BIOS checkpoint from where the control is passed to the different Bus
routines, and the HIGH BYTE of checkpoint is the indication of which
routine is being executed in different Buses. The details of the HIGH
BYTE of these checkpoints are as follows:
HIGH BYTE XY
The upper nibble ’X’ indicates the function # is being executed.
’X’ can be from 0 to 7.
0 = func#0, disable all devices on the Bus concerned
1 = func#1, static devices init on the Bus concerned
2 = func#2, output device init on the Bus concerned
3 = func#3, input device init on the Bus concerned
4 = func#4, IPL device init on the Bus concerned
5 = func#5, general device init on the Bus concerned
6 = func#6, error reporting for the Bus concerned
7 = func#7, add-on ROM init for all Buses
Code
Description
B0
System configuration is displayed.
B1
Going to copy any code to a specific area.
00
Copying of code to a specific area done. Going to give control to
INT 19H boot loader.
BIOS MESSAGES
A-14
TECHNICAL REFERENCE
Summary of Contents for SB586TCP/166
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