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7521
Plus / N N/B MAINTENANCE
Plus / N N/B MAINTENANCE
7. Maintenance Diagnostics
7.2 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
1Dh Initialize
1Eh Initialize monoc
1Fh Test 8237A pa
20h Perform
21h Test &
22h Check if CMOS RAM valid
23h Test batter
24h Test the DMA controlle
25h Initialize 8237A controller
26h Initialize
27h RAM qui
28h Protected mode ent
29h RAM te
2Ah Protect
2Bh Setup shadow
2Ch Prepare
2Dh Search fo
2Eh Search fo
2Fh Signon messa
30h Special i
31h Test if ke
32h Test ke
33h Test ke
34h Test, blank and count all RAM
35h Protected mode ent
36h RAM te
DESCRIPTION
color adapter
hrome adapter
ge registers
keyboard self test
initialize keyboard controller
y fail & CMOS X-SUM
rs
interrupt vectors table.
ck sizing
ered safely
st completed
ed mode exit successful
to initialize video
r monochrome adapter
r color adapter, VGA initialize.
ges displayed
nit of keyboard ctlr
yboard present
yboard interrupt
yboard command Byte
ered safely (2).
st complete