100

 

 

 

 

6 Technical Reference

 

 

 

 

 

 

 

 

Diagnostic LED Decoder

 

 

Post

 

 

 

 

 

 

G=Green,R=Red,A=Amber

Description

 

Code

 

 

 

 

 

 

 

 

MSB

 

 

LSB

 

 

 

 

 

 

 

 

 

08h

G

Off

Off

Off

Verify CMOS Checksum.

 

 

 

 

 

 

 

07h

Off

G

G

G

Read Microcode updates from

 

 

 

 

 

BIOS ROM.

 

 

 

 

 

 

 

07h

Off

G

G

G

Initializing the processors. Set up

 

 

 

 

 

processor registers. Select least

 

 

 

 

 

featured processor as the BSP.

 

 

 

 

 

 

 

0Bh

G

Off

G

G

Hook before the keyboard BAT

 

 

 

 

 

command is issued.

 

 

 

 

 

 

 

0Ch

G

G

Off

Off

Keyboard Controller Test: The

 

 

 

 

 

keyboard controller input buffer

 

 

 

 

 

is free. Next, issuing the BAT

 

 

 

 

 

command to the keyboard

 

 

 

 

 

controller.

 

 

 

 

 

 

 

0Eh

G

G

G

Off

Init after Keyboard Test: The

 

 

 

 

 

keyboard controller BAT

 

 

 

 

 

command result has been

 

 

 

 

 

verified. Next, performing any

 

 

 

 

 

necessary initialization after the

 

 

 

 

 

keyboard controller BAT

 

 

 

 

 

command test.

 

 

 

 

 

 

 

0Fh

G

G

G

G

Write Command Byte 8042: The

 

 

 

 

 

initialization after the keyboard

 

 

 

 

 

controller BAT command test is

 

 

 

 

 

done. The keyboard command

 

 

 

 

 

byte will be written next.

 

 

 

 

 

 

 

10h

Off

Off

Off

R

Keyboard Init: The keyboard

 

 

 

 

 

controller command byte is

 

 

 

 

 

written. Next, issuing the pin 23

 

 

 

 

 

and 24 blocking and unblocking

 

 

 

 

 

commands.

 

 

 

 

 

 

 

10h

Off

Off

Off

R

Disable and initialize 8259.

 

 

 

 

 

 

 

Page 110
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Acer R700 manual 100, Bios ROM