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PRELIMINARY SERVICE CHECKS
This data provides the user
with
a
time
saving service
tool
which is designed
for
quick
isolation
and repair
of
Computer
malfunctions
.
Check all
interconnecting
cables
for
good
connection
and
correct
hookup
before making service
checks
.
Replacement
or
repair
of
the Power Supply, Main Boar
d,
or
Keyboard
or
connectors
may be necessary
after
the mal-
function
has been isolated.
GENERAL OPERATING INSTRUCTIONS
PO
WER
UP
The
Computer
will
come
on
ready
to
program in Com·
modore Basic when turned On.
For
instructions
on loading
and saving programs see "Cassette
or
Disk Operationn sec-
tion
of
the General Operating
Instructions
. To run a pro-
gram
when
loaded, type RUN and press the RETURN key.
To
stop
a program in progress, press the RUN/STOP key. A
program can
also
be
stopped
by
pressing
RESET
button
on
the ri
ght
side
of
the
Computer
but
the program
will
also be
lost.
MONITOR PROGRAM
The
Computer
has a
built·in
Monitor
program
to
enable the
user
to
program
with
machine
language. To
go
from
Basic
to
Monitor,
hold
down
the RUN/STOP key and press the
RESET
key. The word MONITOR will appear at the top left
of
the display screen. To
go
back
to
Basic
from
Monitor,
type X and press the RETURN key.
CASSETTE OPE
RAT
IO
N
Plug a Datassette Recorder
into
Con
nector
CN3 at the rear
of
the Computer. Note: A standard tape recorder
will
n
ot
work
on the
Commodo
re Plus/4. To load a program,
ty
pe
LOAD, press the RETURN key and fol
low
the in
structions
displayed on the
Monitor
screen. To save a program, type
SAVE, press the RETURN key and
follow
the
instructions
displayed on the screen.
DISK OP
ER
ATION
Connect
Disk Drive
unit
to
the Serial 1/0
Connector
(CN2)
located
at
the rear
of
the Computer. Carefully insert the
diskette
so that the label on the
diskette
is facing up and
the
notch
on the
diskette
is on the
left
side. Once
th
e
diskette
has been inserted,
close
the
protective
gate
by
pushing
down
on
the gate lever. To load a program fr
om
the
diskette
, type LOAD "PR
OG
RAM NAME", 8 and press t
he
RETURN key. To save a program, type SAVE "PROGRAM
NAME", 8 and press the
RET
UR
N key.
NOTE: Number 8 is the Device
number
the D
isk
Drive is nor·
mally set up for. The device
number
can be any n
umber
from 8
to
11
depending on how the device number
jumpers
are
connected
in the Disk Drive.
Datasette
is
a trademark
of
Commodore
Business
Machines, Inc.
DISASSEMBLY INSTRUCTIONS
CA
BI
NET TOP
RE
MOVAL
Remove five screws
from
cabinet
bottom
holding
keyboard
assembly and cabinet top. Carefully
lift
cabinet top
from
unit
and
disconnect
keyboard ribbon
wire
from main board.
KEY
BO
A
RD
REMOVAL
Remove
eight
screws
holding
keyboard
assembly
to
cabinet top.
Lift
Keyboard from cabinet top.
CPU
BOA
RD
RE
MOVAL
Remove five
sc
rews
holding
C
PU
board
to
cabinet b
ottom.
Lift
CPU board from cabinet.
Howard
W.
Sams
& Co., Inc.
4300
West
62nd
Street
.
P.O.
Box 7092. Indi
anap
olis.
Indiana 46206 U.S.A.
Th.
listing
01
any o\!oUobl.
replac.ment
po,t
nere
in
doel
not
R.prod
...
cIlOfl
or
ule.
wllho
...
1
••
pr.1I
pe,mlilion.
01
ediloriol or pictorIa l
cOnslllut. in any
cal.
a flKOmmendoli
on
.
warranty
or
guaranty
by
conl.nl
. I" any
mon".r
.
11
pr
ohibited
. No
pol."ll/
oblllty I, o
..
...
~
wilh
Howard W. Soml &
Co
..
In
c
.•
01
10
,h.
quality
and
lu
ilobility
01
luch
r.lpeel
to
11'1.
u
••
of
In.
Informollon conlol
ned
....r
.i".
replac.menl
porI.
Th.
numbers
01
Ih
...
po,1I
h"".
be.n
compiled
Cl
1965 Howard W.
Slm.
&
CO
.•
1m::
.
Irom I
"Iormollon
!u",
'
shed
10
Howo,d W.
Soml
&
Co
..
Inc
..
by
'h.
4300
W.s
I 62nd
SI,_I
. P.O.
80.
7092. IndionopoUs. Indiana -'6206
U.S
.A.
mon
...
loclu,
...
01
Ih.
po,l
lc
...
lor type
01
replac.m.nt
porlli.ted
. Prlnled In
U.S
.
01
America. 84
CC1
49
31
DATE 1.85
