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Mitsubishi Electric PH440 User Manual Page 33

Pentium ii processor-based nlx profile motherboard.
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P H 4 4 0 N L X M o t h e r b o a r d U s e r G u i d e
The BIOS also issues Port 80h codes that can be displayed using a suitable diagnostic card. The
codes can be used to determine the failure.
Code
02h
03h
04h
06h
08h
09h
0Ah
0Bh
0Ch
0Eh
0Fh
10h
11h
12h
13h
14h
16h
17h
18h
1Ah
1Ch
20h
22h
24h
26h
28h
29h
2Ah
2Ch
2Eh
2Fh
30h
32h
33h
34h
35h
MITSUBISHI ELECTRIC MOTHERBOARD DIVISION
POST Routine Description
Verify Real Mode
Disable Non-Maskable Interrupt (NMI)
Get CPU type
Initialise system hardware
Initialise chipset with initial POST values
Set IN POST flag
Initialise CPU registers
Enable CPU cache
Initialise caches to initial POST values
Initialise I/ O component
Initialise the local bus IDE
Initialise Power Management
Load alternate registers with initial POST values
Restore CPU control word during warm boot
Initialise PCI Bus Mastering devices
Initialise keyboard controller
BIOS ROM checksum
Initialise cache before memory autosize
8254 timer initialisation
8237 DMA controller initialisation
Reset Programmable Interrupt Controller
Test DRAM refresh
Test 8742 Keyboard Controller
Set ES segment register to 4 GB
Enable A20 line
Autosize DRAM
Initialise POST Memory Manager
Clear 512 KB base RAM
RAM failure on address line
RAM failure on data bits of low byte of memory bus
Enable cache before system BIOS shadow
RAM failure on data bits of high byte of memory bus
Test CPU bus- clock frequency
Initialise Phoenix Dispatch Manager
Test CMOS RAM
Initialise alternate chipset registers.
S e p t e m b e r 1 9 9 8
PAGE 33 OF 51

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