Specifications
7.5
ERROR
REPORTING
All
dia~nostics
at
all
levels
of
microcode
attempt
to
report
errors
in
each
of
three
wa~s:
i.
Error
code
to
Mother
Board
LED's
2.
E~ror
code
to
LK201
Ke~board
LED's
3.
Error
code
to
Host's
Interrupt
Reason
Re~ister
(CSR
il)
The
error
code
is
a
n~bble
(4
bits)
code
identifyin~
the
test
that
failed.
The
code
is
the
same
for
all
three
error
code
output
forms.
POWERUP:
~reen
led
off,
test.
in
LEDS.
Code
set
in
advance
of
test.
If
error,
skip
rest
of
powerup
dia~nostics
and
freeze
·the
led
code
durin~
idle
loop
tests.
IDLE LOOP:
~reen
led
on,
test
t
in
LEDS.
Code
set
in
advance
of
test.
If
error,
replace
led
code
with
powerup
error
code;
that
is,
~reen
led
off
and
test
t
in
leds.
I~nore
rest
of
idle
loop,
freeze
leds,
but
start
testin~
a~ain
at
be~innin~
of
next
idle
loop.
MANUFACTURING:
read
status
for
Jumper.
No
keyboard
leds
or
reportin~
to
host
or
before
reaching
·process_errors·).
Loop
otherwise
loop
back
to
the
be~inning
of
out
interrupt
and
reloading
the
stack).
Green
led
on,
test
i
in
leds.
screen
message
(that
is,
loop
on
any
test
that
fails,
but
powerup
(after
first
lockins