85
7521
7521
N/B MAINTENANCE
N/B MAINTENANCE
6. Maintenance Diagnostics
6.2 Error Codes : Following is a list of error codes in sequent display on the PIO debug board.
SYSTEM SOFT BIOS:
CODE DESCRIPTION
01h Start of boot loader sequence.
02h Initialize chipset.
03h Memory Sizing.
Perform conventional RAM(1st 640K) test with crossed-04h
pattern R/W
05h Move boot loader to the RAM.
06h Start point of execution of boot loader in RAM.
07h Shadow system BIOS.
08h Initialize clock synthesizer
09h Initialize audio controller.
0Ah Detect internal ISA MODEM
0Bh Proceed with normal boot
0Ch Proceed with crisis boot
0Fh DRAM sizing
10h Initial L1,L2 cache, make stack and diagnose CMOS.
11h Turn off fast A20 for post. Reset GDT's, 8259s quickly.
12h Signal power on reset at COMS.
13h Initialize the chipset, (SDRAM).
14h Search for ISA bus VGA adapter
15h Reset counter/timer 1, exite the RAM.
16h User register config through CMOS
18h Dispatch to 1st 64K RAM test
19h Checksum the ROM
1Ah Reset PIC's(8259s)
1Bh Initialize video adapter(s)
1Ch Initialize video (6845 regs)
CODE DESCRIPTION
1Dh Initialize color adapter
1Eh Initialize monochrome adapter
1Fh Test 8237A page registers
20h Perform keyboard self test
21h Test & initialize keyboard controller
22h Check if CMOS RAM valid
23h Test battery fail & CMOS X-SUM
24h Test the DMA controllers
25h Initialize 8237A controller
26h Initialize interrupt vectors table.
27h RAM quick sizing
28h Protected mode entered safely
29h RAM test completed
2Ah Protected mode exit successful
2Bh Setup shadow
2Ch Prepare to initialize video
2Dh Search for monochrome adapter
2Eh Search for color adapter, VGA initialize.
2Fh Signon messages displayed
30h Special init of keyboard ctlr
31h Test if keyboard present
32h Test keyboard interrupt
33h Test keyboard command Byte
34h Test, blank and count all RAM
35h Protected mode entered safely (2).
36h RAM test complete
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