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Nec express5800 tm800 nl Manual

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User Guide
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www.nec-computers.com
Error Messages
This section describes the POST error codes and messages.
POST Error Codes and Messages
Whenever a recoverable error occurs during POST, BIOS displays a message on the
video display screen and causes the speaker to beep as the message appears. BIOS also
issues a beep code (one long tone followed by two short tones) during POST if the
video configuration fails or if an external ROM module does not have the correct
checksum. The BIOS indicates errors by writing an error code to the PS/2-standard log-
ging area in the Extended BIOS Data Area, and by displaying a message on the screen,
which is sometimes preceded by the POST Error Code. The error code will also be
logged to the Event Logging area.
POST Error Codes and Messages is a list of the error codes and messages written at the
start of each POST test. The table below lists the beep codes issued for each POST test.
The devices associated with the POST error codes are shown in subsection POST Error
Code Hardware References that follow.
Table 20: Memory Errors And Messages
On-screen error
message
Description / Action to be taken
Gate20 Error The BIOS is unable to properly control the mother-
board’s Gate A20 function, which controls access of
memory over 1 MB. This may indicate a problem with
the motherboard.
Multi-Bit ECC Error This message will only occur on systems using ECC
enabled memory modules. ECC memory has the abil-
ity to correct single-bit errors that may occur from
faulty memory modules.
A multiple bit corruption of memory has occurred,
and the ECC memory algorithm cannot correct it. This
may indicate a defective memory module.
Parity Error Fatal Memory Parity Error. System halts after display-
ing this message.
RAM R/W test failed This message is displayed by the AMIBIOS8 when
the RAM read/write test fails.
CMOS Memory Size
Wrong
The base memory (memory below 1MB) size that is
reported in the CMOS (offset 15h) mismatches with
the actual size detected. This condition may occur
when the hole is set at 512K base memory or when
CMOS is corrupted.
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