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27BPC-500-5820 User's Manual
POST Code Error Messages
The following codes are not displayed on the screen. They can only be viewed on the
LED display of a so called POST card. The codes are listened in the same order as the
according functions are executed at PC startup. If you have access to a POST Card
reader, you can watch the system perform each test by the value that's displayed. If the
system hangs (if there's a problem) the last value displayed will give you a good idea
where and what went wrong, or what's bad on the system board.
CODE CHECK DESCRIPTION OF CHECK
C0 Turn Off Chipset OEM Specific-Cache control Cache
01 Processor Test 1 Processor Status (1FLAGS) Verification. Tests the
following processor status flags:carry, zero, sign,
overflow, The BIOS sets each flag, verifies they are
set, then turns each flag off and verifies it is off.
02 Processor Test 2 Read/Write/Verify all CPU registers except SS, SP,
and BP with data pattern FF and 00.
03 Initialize Chips Disable NMI, PIE, AIE, UEI, SQWV Disable video,
parity checking, DMA Reset math coprocessor
Clear all page registers, CMOS shutdown byte
Initialize timer 0, 1, and 2, including set EISA timer
to a known state
Initialize DMA controllers 0 and 1 Initialize interrupt
controllers 0 and 1 Initialize EISA extended
registers.
04 Test Memory RAM must be periodically refreshed to
Refresh Toggle keep the memory from decaying. This function
ensures that the memory refresh function is
working properly.
05 Blank video Keyboard controller initialization
Initialize keyboard
06 Reserved
07 Test CMOS Verifies CMOS is working correctly,
Interface and detects bad battery.
Battery Status
BE Chipset Default Program chipset registers with power
Initialization on BIOS defaults.
C1 Memory presence OEM Specific-Test to size on-board
test memory
C5 Early Shadow OEM Specific-Early Shadow enable for fast boot.
C6 Cache presence External cache size detection
test
08 Setup low memory Early chip set initialization
Memory presence test
OEM chip set routines
Clear low 64K of memory
Test first 64K memory.
09 Early Cache Cyrix CPU initialization
Initialization Cache initialization
0A Setup Interrupt Initialize first 120 interrupt
Vector Table vectors with SPURIOUS_INT_HDLR and initialize
INT 00h-1Fh according to INT_TBL
0B Test CMOS RAM Test CMOS RAM Checksum, if bad, or
Checksum insert key pressed, load defaults.
0C Initialize Detect type of keyboard controller
keyboard (optional)
Set NUM_LOCK status.
0D Initialize Video Detect CPU clock.
Interface Read CMOS location 14h to find out type of video
in use.
Detect and Initialize Video Adapter.
0E Test Video Test video memory, write sign-on
Memory message to screen.
Setup shadow RAM - Enable shadow according to
Setup.
0F Test DMA BIOS checksum test.
Controller 0 Keyboard detect and initialization
10 Test DMA
Controller 1