CE-1983-03.pdf

(12479 KB) Pobierz
Computers
&Ei
cetronics
MARCH
1983
foer1g
Popular
Electron les
A
PRACTICAL
GUIDE:
"n
How
Video
Recordists
Tap
Cable TV
Programs
"Working"
the Computer Networks
Learning
16
-Bit
Microcomputer
Technology
The
British
Are
Coming!
First
-hand
examination
of
BBC
and
Torch
Micro-
computers
o
w
.
5
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03
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14024
142 78
Tested
in
This
Issue:
Zenith
"System
3"
Color
TV
Receiver
(with
outgoing
and
incoming wireless telephone control)
Marantz
46
watts/channel
Stereo
FM
/AM Receiver
www.americanradiohistory.com
THE
LEADING
EDGE
IN
PRINTERS
ONE GREAT
LINE.
ONE GREAT
WARRANTY.
Finally,
there's
one
full
family of
printers
that
covers
every
business or
word
processing application
all
from
C.
Itoh,
a
company
known
for
packing more product
into
less price;
and
all
distributed
exclusively
by
Leading
Edge,
a
company known,for
searching
out
and providing
that
very
thing.
Which means
that one
call
to one
source can
get
you
any
printer,
any
time you need
it,
for
any
purpose.
All
backed
by
a
full
years'
warranty
from Leading
Edge. (Try
that
on any other
line of printers.)
-
The
Prowriters:
business printers
-and
more. The
"more"
is
a
dot-matrix
process
with
more dots.
It
gives
you
dense
correspondence
quality copy
(as
opposed
to
business
quality
copy,
which
looks
like
a
bad
job
of spray
-painting).
Prowriter
:
120
cps.
80
columns
dot matrix
compressable to
136. 10"
carriage.
Parallel
or
serial
interface.
Prowriter
2:
Same
as
Prowriter, except
15"
carriage allows
full
136
columns
in
normal print mode.
Parallel
or
serial
interface.
THE
PRO'S.
imizaimmilmormumemi
THE
STAR.
The
Starwriter
F -10.
In
short
(or
more
precisely,
in
a
sleek
6"
high,
30
-pound
unit),
it gives
you
more
of
just
about
everything-
except bulk and
noise
-than
any other
printer
in
its price range.
It's
a
40
cps
letter -quality
daisy -wheel
with
a
bunch of
built
-in
functions to simplify and speed up
word
processing.
It
plugs
into
almost
any
micro
on the
market,
serial
or
parallel.
PR©WRITER
STA17VVR'I1132
F-10
The Printmaster
F
-10.
Does
all
the
same
good
stuff
as
the
Starwriter
except, at 55
cps,
the
Master does
it faster.
THE
MASTER.
i
PRgVTMASTER
F-10
Distributed
Exclusively
by
Leading
Edge Products.
Inc..
225
Turnpike
Street. Canton.
Massachusetts
02021.
Call:
toll
free
1
-800-343-6833.
or
in
Massachusetts
call collect
16171
828-8150
Telex
951 -624.
CIRCLE
NO.
20
ON
FREE
INFORMATION
CARD
www.americanradiohistory.com
the
$7
Push
Button
Phone
Send back
your
dumb
phones.
Now
in-
stead
of
paying
monthly
service charges
you
can have push
button
dialing,
last
number redial, mute,
and
ringer
off.
You
can
forget
big
clunky
phones.
You
can also
forget
dials.
This phone
works
perfectly whether
you now
have
rotary
or
push
button
phones.
Now
for
just
$7
you'll
have
the latest
technology
at
a
price
that'll
let you
have
a
phone
in
every
room
in
your
home.
Plug in and
start
pushing. Now
you
can have
highly
automated
phones
with
no
monthly
service
charges
for
just
$7
each.
But,
there's
a
catch.
We
challenge
you
to
compare the fre-
But,
don't
forget
there's
a
catch.
NOTHING
TO
INSTALL
Simply
plug
this
phone
into
any stand-
ard
modular
phone
jack
and
start talk-
ing.
If
you
don't
already
have
jacks,
call
your
phone
company.
They
may
even
put
them
in
free
for
quality
speaker instead
of
the old
dia-
quency
response,
dynamic
range
and
sig-
phragm
'thing'
that's
been
in
phones
for
nal
to
noise
ratio
of
our
new
Gold
20 years.
Even
the
electronic
ring
is
new.
Label
MLX
to
Maxell
UDXL
or
TDK
But,
the nicest
part
of
all
are
the
push
SA.
If
they win, we'll
not only
give
you
buttons.
Once
you've
started
using
but-
back
your
money,
we'll
give
you
a
free
tons
you'll
hate
dialing
the old way.
gift for
your trouble. And, DAK's
come
With
this phone you
can push
the but-
with
a
deluxe
hard
plastic box, index
in-
tons
as
fast
as
you want.
Then the phone
sert
card
and
a
limited
1
year
warranty.
sends
out
pulses on
your
line
that
work
WHY,
YOU
MAY
BE
ASKING?
with
virtually
any
phone system.
You're
very valuable
to
us
in
the
form
So
this
phone works anywhere. You
of future
business.
Over
150,000 custo-
can
unplug
it
and move
it from
room
to
mers
have
responded
to
bonuses
like
room or
house
to
house
in
seconds.
this.
We
find
most
of
you
keep
buying
The phone
automatically
hangs
up once
you've tried our
cassettes and
our
when
you
set
it
down or you
can push
prices;
and
that's
a
gamble
worth taking.
its
'hang
up'
button. It
comes
complete
NOT A BAD CATCH
with
an 8
foot
cord, coiled
at
the phone
DAK
manufactures
a
cassette
with
no
end,
and
a
limited warranty.
problems
and
great
sound.
We've
been
hot
on
the
heels
of
the
frequency
res-
ponses
of
Maxell
and
TDK.
The tape
we
made last
year
had
a
great
frequency
response up
to
14,000hz.
Now our
new
Gold
Label
MLX
is
second
to
none.
We have
a
frequency
response
to
19,500hz
and
we'll
go head
to
head
against any tape on
the
market.
TRY
NEW
DAK MLX90
CASSETTES
It's
built
more
like
a
HiFi than
a
telephone. Modern electronics
have
finally
come to phones.
you.
Due
to
the recent Supreme
Court
ruling,
soon
they'll
probably
be
selling
you
your
own
phones
anyway. And,
at
worst,
there's just
a
small one
time
fee.
LAST NUMBER
REDIAL
PLUS
It's really
neat.
If
you
call
a
number
and
it's
busy
this
phone
will
automa-
tically
redial the
number
for
you
each
time
you touch
'redial'.
There's
no
need
to
keep
dialing
over and over
again.
When
you
need
to
speak
privately to
someone
with
you,
you
don't
have
to
cover the
mouth
piece. Just
press
the
mute
button
and
the
person on
the line
will
be
cut
off for
privacy.
When
you
want
to
take
a
nap,
just
switch
the ring
off
and
the phone
won't
ring. There's
never
a
need
to
take
your
phone
off
the
hook
again.
The
quality
is
great.
A
high
quality
condenser
microphone
lets
the
person
you
talk to
hear
you loud
and
clear.
And
you
hear
them
through
a
high
THE CATCH
Frankly
we
are
losing
our shirts
on
the
automated phone,
but
we're
looking
for
audiophiles who
use
audio
cassettes.
If
you buy
top
name
TDK
and
Maxell
cassettes,
you
probably
pay
$3.50
to
$4.50
each
for
a
90
minute
cassette.
We
want
you
to
try
DAK's
new
Gold
Label
MLX ultra
high energy,
normal
bias
cassettes.
Not
at
$4.50
or
even
at
$3.50
each,
but
at
a
factory direct
price
of
just $2.49
for
a
90
minute
cassette.
RISK FREE
To
get
the
automated
phone
for
just
$7,
try
10
MLX
high energy cassettes.
If
you
aren't
100%
satisfied,
return only
9
of
the
10 cassettes
and
the phone
in its
original box
within
30
days
for
a
refund.
The 10th
cassette
is
a
gift for your
time.
To
order
your
10
Gold
Label
DAK
MLX
90
minute
cassettes and get
the
automated
phone
for
only
$7
with your
credit
card,
call
the
DAK toll
free
hot
line
or
send
your
check
for
only
$24.90
for
the
tapes, plus $7
for
the phone
and
$3
for
postage and
handling
for
each
group. Order
No.
9416. CA
res
add
6 %.
An automated
Phone
for
$7 and
DAK's
new
improved
MLX.
Time
to
stock up.
DAK
CIRCLE
NO.
67
ON
FREE
INFORMATION
CARD
INDUSTRIES INCORPORATED
CALL TOLL
-FREE
...1-
800 -228 -1234
10845 Vanowen St.,
N.
Hollywood
CA
91605
f
busy,
after
hours,
on
weekends or
in CA
TOLL
-FREE
1-
800
-423
-2636
The
new
FIX-20
Notebook
Computer.
Where
was
it
when
I
was
a
kid?
E
load and store programs, play games, even interface with
other
computers through
a
telephone modem.
But
that's
where
the similarity
ends.
Because,
unlike
a
desk-
top, the
HX -20
has
the
hardware
you
need
to
do word
and
data processing anywhere.
Built in.
It
has enough
internal
power
to
run
for
50
-plus hours,
a
full -size
keyboard,
a
scroll-
able
LCD
screen,
even
a
handy
little
microprinter.
But
more importantly, it has something that no comparable
personal computer
can match:
a
price tag
of
under
$800. You
can
have
everything you
need
to
do real
computing
for
a
lot
less
than
the cost
of
most desktop computers.
A
lot less.
The
new Epson
HX-20
Notebook Computer
is
perfect
for
kids.
But
it's
not
just
for
kids.
The HX-20
has
as
much
total memory as
most
popular
desk-
top
computers. And,
like
a
desktop,
you can
connect
it
to
a
monitor,
add
extra memory,
use
a
cassette
or
microcassette
to
The
new
Epson
HX -20
Notebook Computer.
It's
perfect
for
kids,
salespeople, business
executives,
students
anyone
who's looking
for
an
affordable way into serious
computing.
For
the Epson
computer
dealer nearest you,
just
call
(800)
421
-5426, or in
California
(213) 539
-9140.
Try it
out.
After
all,
why
should
kids
have
all
the
fun?
-
EPSON
EPSON AMERICA,
INC.
COMPUTER PRODUCTS DIVISION
3415
Kashiwa Street
Torrance,
California
(213)
539 -9140
CIRCLE
NO.
25
ON FREE
INFORMATION
CARD
Computers
&E
led
ron
les
MARCH
1983
VOLUME
21,
NUMBER
3
FEATURE ARTICLES
COLUMNS
LES
SOLOMON
ON
COMPUTER HARDWARE
Adding
a
Video
Monitor
To
Your
Sinclair
ZX81.
39
59
60
69
81
THE BRITISH ARE COMING!
Stan
Veit
/Evaluation
of
the BBC
and
Torch
microcomputers.
31
CROSSED SIGNALS
B.K.
Roberts
/A
logic
quiz.
THE COMPUTER NETWORK MAZE,
Part
Stan
Veit
/How
to
use the various
communication
networks available on your microcomputer.
1
35
STAN VEIT
ON
COMPUTER SOFTWARE
Software for Mass Markets and Integrated Packages.
inn
102
103
PROGRAMMER'S NOTEBOOK
/Jim
Keogh
How
to
Use
Subroutines.
COMPUTER VIDEO GAMES
SOLID -STATE DEVELOPMENTS
/Forrest
New Peripheral Transforms Apple
Computerized Oscilloscope.
11
THE VIDEO CONNECTION
Dave Trowbridge
/An
equipment and hook
-up
guide for
cable -TV viewers and
VCR
recordists.
16
-BIT
MICROCOMPUTER TECHNOLOGY
George Meyerle
/Part
1:
The
first
in
a
series on learning
about an 8088-based computer.
M.
Mims
into
a
107
109
COMPUTER HOTLINE
DX
LISTENING
/Glenn
Hauser
Around
the World.
CONSTRUCTION ARTICLES
111
EXPERIMENTER'S CORNER
/Forrest
M.
Mims
Experimenting with VMOS Power Transistors.
52
9
MICROCOMPUTER JOYSTICK INTERFACING
METHODS
Randy Carlstrom and Ralph
Tenny
/Two
ways
to
interface
a
joystick or paddle
to
your
computer.
1
1A
PROJECT
OF
THE MONTH
/Forrest
M.
Mims
A
Digitally Programmable VMOS Variable Resistor.
2
A PSEUDO CURSOR FOR OSCILLOSCOPES
D.E.
Patrick
/Add
a
calibrated
time base
to
dual -trace scopes.
USE
A
TRIPLE -THREAT
IC
Sami
A.
Shakir
/Versatile
uses
of
the CD4040 CMOS
IC.
DEPARTMENTS
EDITORIAL /Art
Salsberg
The
Calculator Connection.
95
98
6
7
12
AUTOMOBILE
IDIOT LIGHTS
Richard
M.
Hilbert/Circuit
monitors your car's electrical system
LETTERS
NEW PRODUCTS
EQUIPMENT
REVIEWS
ZENITH SYSTEM
3
MODEL SY1963W
19" COLOR
TV RECEIVER
99
106
115
128
LITERATURE
OPERATION ASSIST
16
ADVERTISERS'
INDEX
COMPUTER MART
/ELECTRONICS CLASSIFIED
22
MARANTZ
SR620CX AM
/FM
STEREO
RECEIVER
COVER PHOTO
BY
JAY BRENNER
COPYRIGHT
c 1983 BY
ZIFF-DAVIS PUBLISHING COMPANY. All rights reserved. Computers
&
Electronics
(ISSN
0032 -4485) March
1983,
Volume
21,
Number
3.
Published monthly by Ziff -Davis
Publishing Co.,
at
One Park Ave., New York,
NY 10016.
Richard
P.
Friese, President; Selwyn Taubman, Treasurer; Bertram
A.
Abrams, Secretary. One year subscription rate for
U.S.
and Possessions,
$15.97; Canada, $20.97;
all
other countries, $23.97
(cash orders only, payable
in
U.S.
currency). Second Class Postage
Paid at
New York,
N.Y.
10016 and at
additional mailing offices. Authorized
as
second class
mail by the Post
Office
Dept., Ottawa, Canada, and tor
payment of postage
in
cash. POPULAR ELECTRONICS including ELECTRONICS WORLD trademark registered. Indexed
in
the
Reader's
Guide to Periodical Literature.
Ziff -Davis also publishes Boating,
Car
and Driver, Cycle, Flying, Popular Photography, Skiing, Stereo Review, Electronic Experimenter's Handbook, and Tape
Recording
&
Buying Guide.
POSTMASTER:
Send address changes to COMPUTERS
&
ELECTRONICS. Circulation
Dept.
P.O.
Box 2774, Boulder, CO 80302. Please allow
at
least eight weeks for
change
of
address, enclosing,
if
possible,
an
address label from
a
recent
issue.
Permissions.
Material
in
this publication may not be
reproduced
in
any form
without permission. Requests
for
permission should be directed to John Babcock, Rights and Permissions, Ziff -Davis Publishing
Co.,
One Park
Ave.,
New York,
NY 10016.
March1983
3

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