Troubleshooting
POST
Before
your
DECpc
433
Workstation can
be
used, all system
components
must
be
initialized
and
tested,
and
the
operating system
loaded
into
memory. The
basic
inpuVoutput
system (BIOS)
that
is stored in
ROM
controls this
sequence
of actions. A portion of
the
BIOS contains a
Power-on
Self Test (POST).
POST
is responsible for initializing
and
testing
system
components
each
time
power
is applied
or
when
the
system boots. The
remainder
of
the
BIOS loads
the
operating system
and
specific applications.
POST consists
of
a set of tests
used
to check the
condition
of the system
circuitry
and
report
system malfunctions. The organization of
POST
allows
testing to progress from the lowest level
of
hardware
to
the
initialization of
external peripherals e.g., disk drives, keyboard, monitor, etc.
There
are
two
types
ot POST tests: system board
hardware
and
peripheral
harU.ware.
System Board Hardware Tests
POST checks
the
system board
hardware
first.
If
any
of
these tests fail, a fatal
error
condition exists
and
further testing
and
initialization is not possible.
You are notified
that
an
error condition exists by
the
lighted fault LEDs
on
the
system
board
and/or intelligent graphics controller,
an
error message
displayed on
the
monitor screen,
or
beeps from
the
system speaker. Refer
to
the
I:sts of POST
error
messages
and
beep codes
provided
at
the
end
of
this
chapter. The following identifies
the
system
hardware
tests
and
their
order
of
execution:
• Programmable Interrupt Controller (PIC)
•
82340
chip
set
•
CPU
DECpc
433
Workstation Service
Guide
2-3
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