BIOS Setup Information
ROBO-638 User’s Manual
4-20
Uncompressed Initialization Codes
— The following runtime
checkpoint hex codes are listed in order of execution. These codes are
uncompressed in F0000h shadow RAM.
Code Description
03
The NMI is disabled. Next, checking for a soft reset or a power on condition.
05
The BIOS stack has been built. Next, disabling cache memory.
06
Uncompressing the POST code next.
07
Next, initializing the CPU and the CPU data area.
08
The CMOS checksum calculation is done next.
0B
Next, performing any required initialization before the keyboard BAT
command is issued.
0C
The keyboard controller input buffer is free. Next, issuing the BAT
command to the keyboard controller.
0E
The keyboard controller BAT command result has been verified. Next,
performing any necessary INIT after the K/B controller BATcommand test.
0F
The keyboard command byte is written next.
10
Next, issuing the pin 23 and 24 blocking and unblocking commands.
11
Next, checking if the <End> or <Ins> keys were pressed during power on.
12
To initialize CMOS if the
initialize CMOS RAM in every boot
is set or the
<End> key is pressed. Going to disable DMA and Interrupt controllers.
13
The video display has been disabled. Port B has been initialized. Next,
initializing the chipset.
14
The 8254 timer test will begin next.
19
The 8254 timer test is over. Starting the memory refresh test next.
1A
The memory refresh line is toggling. Checking the 15us on/off time next.
23
Reading the 8042 input port and disabling the MEGAKEY Green PC feature
next. Making the BIOS code segment writable and performing any necessary
configuration before initializing the interrupt vectors.
24
The configuration or setup required before interrupt vector initialization has
completed. Interrupt vector init. is about to begin
25
Interrupt vector initialization is done. Clearing the password if the POST
DIAG switch is on.
27
Any initialization before setting video mode to be done.
28
Going for monochrome mode and color mode setting.
2A
Bus initialization system, static, output devices will be done next, if present.
2B
Passing control to the video ROM to perform any required configuration
before the video ROM test.
2C
To look for optional video ROM and give control.
2D
The video ROM has returned control to BIOS POST. Performing any
required processing after the video ROM had control.
2E
Completed post-video ROM test processing. If the EGA/VGA controller is
not found, performing the display memory read/write test next.
2F
EGA/VGA not found. Display memory R/W test about to begin.
30
Display memory R/W test passed. Look for retrace checking next.
