-
MZ-5600
17. SELF CHECK
17-1
Self check
functions
According
to
the system switch setting, the MZ-5500
automatically provides the
following
self check items using
the check programs contained in the
ROM:
Table
45
•
RAM
check
(system
RAM)
•
ROM
check
(lPL
ROM)
•
MFD
(mini-floppy
disk
drives)
The
detai
Is
of
the check items are:
1)
RAM capacity check.
2)
Data
bus
check
3) Address
bus
check
4) Read/write check on entire
memory
locations
5) Refresh signal check
6) Refresh check
7)
ROM
check
8)
MFD
read/write check
If
an
error
is
detected through the self check, the operator
is
asked
by
an
audible sound alarm and error
message
on
the video
monitor.
During self check execution,
each
check
stage
is
identified
by a short
"beep,"
which should
not
be
taken
as
an
error
alarm.
17-2 Check procedures
Self checking may
be
done
as
follows:
(1)
Set
section 2
of
the system DIP switch (located on the
bottom
of
the System
Unit)
to
ON,
with
the System
Unit
left
turned
off.
1 2
345
678
D~DDDDDD
---OFF---
Fig. 1 System DIP switch
(2) Turn the system on. The check program
will
auto-
matically
start running, and the
total
RAM capacity
will
appear
first
on the
screen
(see
Fig. 2).
I
256K.
Fig. 2
'RAM
capacity display
(3)
Each
time
a check result
is
identified
to
be
normal,
it
is
indicated
by
a short
"beep."
For
example, the
follow-
ing
message
will
appear
if
the RAM check
was
passed:
Fig. 3
Message
for
normal RAM check result
-84-
(4)
If
an
error occurred,
it
is
alerted
by
a long
"beep."
The
long
"beep"
will
sound once
for
a RAM check error,
twice
for
a ROM check error, and three times
for
an
MFD
check error. The pertinent error
type
will
be
shown on the display
as
shown in Fig. 4. The details
of
each
.error
type
will
be
described later. Once the error
message
appears on the screen, check execution
pauses
for
five seconds, then the screen
is
cleared and check
execution proceeds
with
the
next
step.
* *
FEDCBA9876543210
40000H
ERROR
05
I
\.
f
I
!
Fig.4
Error
message
example I
(5)
When
the RAM and ROM check
is
completed, a l
message
as
shown in Fig. 5
will
appear. Insert the t
checking diskette (refer
to
the note below)
into
the .
drive
to
be
checked.
Press
the RESET switch on the !
front
of
the System
Unit
to
start the drive check.
When
the drive check
is
completed, the
message
shown
in
Fig. 5
will
appear again.
If
you wish
to
check another
drive, remove the checking disk
from
the
first
drive
and
i
insert
it
into
the second drive, then
press
the RESET \
,w;"h.
EXCHANG E
DISK
,
PUSH RESET
BUTTON
Fig. 5
MFD
check
prompt
message
(6) When all check items
are
completed,
turn
off
the;
system, and
set
section 2
of
the system DIP
switch!
back
to
the
OFF
position.
Note: For the checking
diskette,
use
a formatted
~
blank diskette
with
no
write
protect
label
I
attached. r
,
17-3 Self test
messages
on display [
17-3-1 Normal message display
Table
46
Message
Meaning
I:
RAM-OK
The
RAM
check
was
okay.
i
ROM-OK
The
ROM
check
was
okay.
I:
EXCHANGE
DISK
Replace
the
diskette
with
the
PUSH
RESET
chec ki
ng
diskette
and press
the
,
BUTTON
RESET
switch.
:
MFD-OK
The
MFD
test
was
passed.
,
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