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Kurzweil K2000 - K2000 Diagnostic Test Execution (v1.0); Test Execution and Interruption

Kurzweil K2000
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SECTION 4
writing
an
arbitrary
test
data
pattern
to
memory
and
reading
it
back,
then
comparing
the
written
data
to
the
read
data.
ROM
tests
involve
comparing
the
data
stored·in
the
ROM
components
to
a
checksum.
I/O
tests
also
send
a
test
data
pattern
from
the
central
processor
to
the
component(s)
being
tested,
and
check
whether
the
data
are
being
exchanged
properly
between
the
central
processor
and
the
tested
component(s).
4.20.1
Memory
te.t.
There
are
two
stages
to
a memory
test:
the
data
test,
and
the
address
test.
In
the
data
test,
a
test
data
pattern
is
written
from
the
processor
to
the
memory
component
being
tested.
The
diagnostic
software
expects
the
data
pattern
that's
written
to
memory
to
be
read
back
exactly
as
it
was
written.
If
this
is
the
case,
the
test
passes.
If
the
observed
data
(the
data
read
from
memory)
differ
from
the
expected
data
(the
data
written
to
memory),
the
test
fails.
When
a
data
failure
occurs,
it
is
displayed
in
the
following
format:
the
memory
address
where
the
failure
occurred;
the
expected
hex
value
at
that
address;
the
actual
observed
value
at
that
address.
See
Figure
4.15
for
an
example.
Figure
4.15
-
Data
Fai~ure
In
the
address
test,
the
central
processor
(CPU-a
Motorola
68301)
checks
every
memory
address
related
to
the
component
being
tested.
A
test
data
pattern
is
written
to
each
address,
and
then
read
back.
The
diagnostic
software
expects
the
data
pattern
to
be
read
back
from
the
same
address
to
which
it
was
sent.
If
the
observed
address
(the
address
read
from)
matches
the
expected
address
(the
address
written
to),
the
test
passes.
If
the
observed
address
does
not
mat~h
the
expected
address,
the
test
fails.
Address
failures
are
displayed
in
the
following
format:
the
expected
address;
the
observed
address.
See
Figure
4.16
for
an
example.
NOTE:
Many
figures
in
this
document
show
values
of
all
zeros.
You'll
see
non-zero
values
for
the
address,
expected
values,
and
observed
values
of
all
tests.
The
expected
and
observed
values
themselves
are
not
significant;
what's
important
is
that
a
difference
between
the
expected
and
observed
values
indicates
a
test
failure.
32

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