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Oupter
2
—
Basic
Component
Set-up
2
Figure 2-8
What
the
Diagnostic
LEDs Mean
1
.
If
the
LED
in
bit
position
7
lights
up
during
self-test,
it
indicates a
failure.
The
exact
test
that failed
is
indicated
by
LEDs
0
through
4,
which
can be
decoded by
the
"Diagnostic
LEDs"
table
above.
2.
If
the
LED
in
bit
position
6
lights
up
during
the
self-test,
it
indicates
the
failure
is
an exception
class failure
—
bus
error
trap,
address
error
trap,
unexpected
interrupt,
etc.
3.
LED
5
is
the
heartbeat
LED.
It
will
start
blinking
after
the
conclusion of
self-test
and
before
the
execution of
UNIX
to
indicate
that
the
CPU
is
acre-
ally
executing
code and
not
hung
somewhere.
4.
LEDs
0-4
indicate the
exact
test
being undertaken during
self-test.
If
LED
7
is
not
lit,
then
the
tests
are
proceeding without
error,
if
LED
7
lights
up,
then
LEDs
0-4
will freeze,
indicating
which
test failed.
Refer
to
the
tabic
above,
if
necessary.
If
all
8
LEDs
are lighting
up
in
sequence from
0
to
7 then back
to
0
again,
it
means
that
you have
exited
self-test
and
UNIX
is
running
successfully.
2.8.
Accessing
the
The 2060
CPU
board has an
EEPROM
that
can be accessed through
the
boot
EEPROM
PROM
monitor.
You
must
first
enter the
monitor
program by
pressing
the
LI
key
(upper
left-hand
comer
of
the
keyboard) and
the
A
simultaneously.
This
will
abort
your
present session
and
put
you
in
the
monitor program.
The
monitor
displays
as
its
characteristic
prompt
the "greater
than" symbol:
^sun
micros
ys
I
ere
Revision
Aof3i
Scpicmbcr 19S6
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