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Kurzweil PC88 - Contact and Support

Kurzweil PC88
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Chapter
2
Diagnostics
Description
of
Tests
CPU
Test
This
test
performs
operations
that
test
the
processor's
internal
registers
and
arithmetic/logic
unit.
Failure
of
this
test
is
most
likely
due
to
failure
of
the
68301
(U21)
processor.
The
only
other
hardware
elements
involved
are
the
EPROMs
(U23
and
U24)
and
associated
address
decoders
(74LS139,
U15;
74F138,
U4;
GAL
16V8,
U11).
Program
ROM
Test
This
test
validates
the
program
ROMs
by
performing
a
checksum
of
the
ROM's
address
space.
Failure
of
this
test
indicates
a
failure
of
an
EPROM
(U23
or
U24).
The
address
decoders
(74LS139,
U15;
74F138,
U4;
GAL
16V8,
U11)
associated
with
the
EPROMs
may
also
be
at
fault.
RAM
Test
The
RAM
Test
writes
to
the
microprocessor
RAM
space
and
verifies
that
the
writing
was
successful.
Failure
of
this
test
indicates
a
failure
of
the
PSRAM
(U18
or
U19),
address
decoders
(74LS139,
U15;
74F138,
U4),
or
memory
protection
and
power
circuitry.
Using
the
Zone
1
button
to
continuously
repeat
the
test,
one
should
be
able
to
observe
periodic
changes
on
the
address
(A0-A13),
data
(D0-D7),
and
control
(WE,
CS1,
CS2,
OE)
lines
of
the
RAM
chips.
PC88
Service
Manual
2-7

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