Table 10-2. Port-80 Codes (continued)

Port 80 Code

Reason

 

 

18

8254 timer initialization

 

 

1A

8237 DMA controller initialization

 

 

1C

Reset Programmable Interrupt Controller

 

 

20

Test DRAM refresh

 

 

22

Test 8742 Keyboard Controller

 

 

24

Set ES segment register to 4GB

 

 

28

Autosize DRAM

 

 

2A

Clear 512K base RAM

 

 

2C

RAM failure on address line xxxx*

 

 

2E

RAM failure on data bits xxxx* of low byte of memory bus

 

 

30

RAM failure on data bits xxxx* of high byte of memory bus

 

 

32

Test CPU bus-clock frequency

 

 

34

Test CMOS

 

 

35

RAMInitialize alternate chipset registers.

 

 

36

Warm start shut down

 

 

37

Reinitialize the chipset (MB only)

 

 

38

Shadow system BIOS ROM

 

 

39

Reinitialize the cache (MB only)

 

 

3A

Autosize cache

 

 

3C

Configure advanced chipset registers

 

 

3D

Load alternate registers with CMOS valuesnew

 

 

Continued

M440LX Server System Product Guide

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