DEC DECstation 5000 Model 100 Series, Maintenance Manual

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The UNIT INFORMATION section describes the type of module
that reported the error.
UNIT CLASS shows that the error occurred in a memory
module.
UNIT TYPE lists the particular type of memory module in
which the error occurred.
ERROR SYNDROME describes the nature of the error.
The ERROR & STATUS REGS section lists the error and status
register contents followed by phrases that describe the register
contents.
EPC indicates that this is an exception program counter.
KN02 STAT REG lists the contents of the CPU status
register (CSR).
ERROR ADDR REG describe the specific error type.
PHYSICAL ERROR ADDR is the address in the hardware
where the error occurred.
CHECK SYNDROME entries describe the actual error and
the module where it occurred.
SYND BITS lists the bits in the check syndrome
register.
The second line states whether this is a single bit or a
mulitbit error.
The third line shows the check bits.
MODULE NUM shows the slot number of the module
that reported the error.
ERROR COUNT shows the total number of errors that
have occurred in this module since the last time the
software was booted.
The last line shows whether this is a bus error or
memory interrupt error.
The ADDITIONAL INFO section lists the controller number
and total number of errors that have occurred at this
address.
3–12 Troubleshooting Tools