Star Tech Journal

Issue: 1984-January - Vol 5 Issue 11

30
STAR*TECH JOURNAL/JANUARY 1984
heJ;
rus
The names of various Videodisc Game
Manufacturers comprise this issue's word
puzzle. Find and encircle these words as
they appear below. They run vertically,
horizontally, diagonally and sometimes
backwards.
VIDEODISC GAME
MANUFACTURES
N D J T E C X E C M
N A A W E C S E J J
T
Y
D
A
G
P
L
P
N A W M C
W F F V I
W Q L A N
L O T J O
N
S
Y
T
R
D
Y
N
S
R
S
N
T T N A T F R S N A
A J. R
E I A
A S G
S T D
T P V
R W X
E A B
F V T
KB
E H
R X
T I
U Z
M U
I R
S V
I TD L K
X A K W C
B M T G R
X E N U I
B N A S E
K I Q L S
I C L M D
N S A C L
Q U N S R Y
I
J Z Z
C X N E L L P T O Z
R V T A L Y U X X W
TSMIIPMZYC
J
IN
75. Why are virtually all switching-type integrated circuits called "digital"?
a. They are about the size and shape of a digit or finger.
b. They process digital information.
c. They switch large working devices on and off.
d "Di" in "digital" means "two," referring to the two purposes of electricity
in systems - processing information and doing work.
e. All but b above.
76. Digital electronic systems are designed by putting together building blocks
available in integrated-circuit form which can be classified as:
a. Processing information or doing work.
b. Positive or negative logic.
c. Decision-making ( or "logic") type, consisting mainly of gates; or memory-
type, containing principally flip-flops.
d Functional and electrical.
e. Switching and amplifying.
77. The meaning of the letter symbols "H" and "L" in functional descriptions
( truth tables) of digital building blocks is:
a. Higher voltage and lower voltage, referring to the two binary digital signal
levels.
b. Higher power and lower power, referring to these two classifications of
semiconductor devices.
c. High frequency and low frequency.
d High current and low current
e. High speed and low speed.
78. If a certain circuit acts as an OR gate when used with negative logic (H = 0, H
= 1 ), what function will it perform when used with positive logic (H = l, L= 0)?
a. AND
b. OR
c. NOT
d NAND
e. NOR
lnQuizitive Answers (December)
70)c
71) e
72) e
73) a
74)e
R W H O N D G G S
ATARI
TAITO
WILLIAMS
BALLY
MYLSTAR
CINEMA TRONICS
FUNAI
DATAEAST
STERN
SIMUTREK
Here is the answer key
to December's puzzle:
TRANSISTOR TERMS

M O S F E T • E •



• • •
• M
• • • • I • • •

• T

• G •
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• • R • • E ,• 0
T
N
C
B
C
H
0
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p L
I
A
T E N
L 0
N
C
L
0
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A R N
C D
R
u R u L
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A
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s
A
B
. . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . .
StaNtTech Journal Technical Seminars
Distributor-sponsored S•TJ Technical Seminars are available at no cost to any
distributors interested in assisting their clients understand operation and maintenance
of videos, pins and lasers.
The 5-day course covers Basic Electronics (Electron theory & semiconductors),
Video Game Systems (Power supplies, control panel interfaces, rasterscan and X-Y
monitors), Electronic Pinball Systems (Electronic digital systems), Trouble-
shooting Techniques, Test Equipment (Digital multimeters and logic probes),
Proper Soldering Techniques, Laser Disc Operation and Maintenance, How to
Read Schematics and other essential skills.
If you'd like to sponsor an S*TJ Technical Seminar, contact Star*Tech
Journal at 609/ 662-3432 and ask for our information package. This package helps
you plan your promotion for a successful seminar.
MOVING? QUESTIONS?
Your address label contains your subscriber account number in the top right
We can more readily change your address or answer your questions if we know
this number. If you are moving and don't have your label, just fill out the
information below and we'll update your account.
OLD ADDRESS
NEW ADDRESS
Your name _ _ _ _ _ _ _ _ _ _
Your name _ _ _ _ _ _ _ _ _ _
Company _ _ _ _ _ _ _ _ _ _
Company _ _ _ _ _ _ _ _ _ _
Addres~ - - - - - - - - - -
City/ State/ Zip
Address, _ _ _ _ _ _ _ _ _ _ _
City/ State/ Zip, _ _ _ _ _ _ _ _ _
Account# (ii known) _ _ _ _ _ _ _
31
STAR*TECH JOURNAL/JANUARY 1984
THE BECKMAN HD-100
The HD-100, the Hardhat meter, is an indispensible
tool that has rugged protection from mishaps and
adverse environments.
2000-Hour Continuous Battery Life
The common 9V transistor battery provides up to
2000 hours of continuous operation, and up to 2
years of life under typical use. For added con-
venience, the decimal point blinks during the last
ten percent of battery life.
Easy-t1>Use Sing le Selector Switch
Makes the instrument easier to use and saves
time. You get a unique switch design that is far
more reliable and durable than found in conven-
tional VOMs.
lnsta·Ohms" Continuity Indicator
You can make continuity checks with the speed
and ease of an analog meter. The lnsta-Ohms"
Continuity Indicator features an ohms symbol that
appears in the display the instant continuity is
established with test leads.
Reliable 100% Factory Burn-In and
Computer Tested
Every function and range is computer tested at the
factory to assure you of a meter that works the
first time, every time.
LCD Shock Mounted
The 3'h digit LCD is shock
mounted to reduce breakage.
High Visibility
Color
The interna tional yellow
color helps prevent
accidental loss.
caused by circuit loading. Increased measurement
accuracy over other comparable meters is achieved
by providing a high input impedance in all OC
voltage ranges.
Guaranteed Long-Term Accuracy
A highly stable band-gap reference element and
thin-film voltage divider network guarantee the
specified accuracy for a one-year minimum,
without calibration
Tough
Thermoplastic
Fire-retardant case
pmv1des protection
against damage from
breakage
Water-tight
Seal
Heavy duly sealing
locks out dirt. grime
and moisture.
Fast and Accurate In-Circuit Diode
Transistor Test Function
This special test function allows accurate
measurements of forward voltage drops across
diode, LEDs, and transistor junctions with 2mA of
"constant'' test current Semiconductor junctions
can also be measured while in-circui~ with as little
as 500 ohms shunt resistance.
ranges.
Completely Equipped to Handle
Your Toughest Jobs
Each unit comes fully equipped with a 9V battery, r -
safety-designed test leads and operato(s manual.
Beckman Warranty
Each instrument comes with a one-year limited
warranty under which Beckman agrees that II t~,
I1stn■11t falls fir 111y r11111 n1t11111r,
IXCl,t 1h11, Beca111 WIii (It Its 1l1ctl11)
ra,1Ir er ra,I1c1 th ■ 1nI■ 1t1r wit~ • 11• ,r
rac11•nI111• ■■ft ., ·~•l11l1■t ~llllly.
Maximum Protection RF Shleldlng
You can enter high RF energy fields generated by
communication transmitters and high voltage
sources with confidence in your results.
The Beckman HD-100 lists for$169. Star*Tech
High Accuracy 22-Megohm Input
lmpedence
This special feature reduces errors commonly
Journal is offering this unit at the special price of
$158.115. Please make your check or money order
payable to Star*Tech Journal, P.O. Box 1065,
Merchantville, NJ 081 09.
-
-
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-
• Fill out and mail • -
-
-
-
-
-
D Rush me _ _ Beckman HD·100(s) at $159.95 each.
Payment is enclosed.
D Rush me _ _ _ Beckman HD·100(s). Ship my order
via UPS C.O.D.
Yoo- na,,.._ _________________ _
Company _________________ _
Addre~ - - - - - - - - - - - - - - - - - -
City/State/Zip ________________ _
New Jersey residents add 6% sales tax.
Mail this coupon to:
Star*Tech Journal, P.O. Box 1065, Merchantville, NJ 08109
Star*Tech Journal is an authorized Beckman distributor.
I
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·--------------------------------- - - ------ - ______ ....
THE BECKMAN DM25
DIGITAL FEATURES . .. AT AN ANALOG PRICE
The Beckman DM25 digital multimeter gives you a wide range of
features at a down-to-earth price.
Features like ...








Five AC and DC voltage and current ranges
Six resistance ranges
A diode test function to test junction forward bias
An instant continuity beeper to make circuit tracing easy
A capacitance test function
Dual voltages for in-circuit or out-of-circuit resistance tests
Conductance to measure extremely high resistance values
Auto-polarity, auto-zero and auto-decimal capabilities to
eliminate guesswork.
• A single function- and range-selector switch for sure and easy
use.
This pocket-size meter is the best, low-cost digital multimeter you
can buy. It measures approximately 51/e'' in length, 3¼" in width
and less than ¼" high. It weighs only 5.75 ounces including
battery.
Also included with your D M25 is a test lead set, spare fuse (2A),
a 9V battery and instruction manual. Your meter is backed by the
Beckman warranty.
ONLY $79.95
You can purchase your Beckman DM25 by filling out the coupon at
right, and sending your check or money order to Star*Tech Journal,
P.O. Box 1065, Merchantville, NJ 08109. Star*Tech Journal is an
authorized Beckman distributor.
Instant
Continuity
Beeper
Dual Voltage Selector
Switch for Resistance Tests
r- -
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-
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-
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•Fill out and mail- -
-
-
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Rush me _ _ _ _ _ _ _ Beckman DM25(s) at $79.95 each.
Payment is enclosed.
D Rush me
_ _ _ Beckman DM25(s). Ship my order via UPS C.O.D.
Yiuna, .. ~- -- - -- -- - - - - - - - -- - - - - - -
Company _ _ ____________ _________ _
Address, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _
City/State/Zip ______________ _______ _
New Jersey residents add 6% sales tax.
Mail this coupon to:
Star*Tech Journal, P.O. Box 1065, Merchantville, NJ 08109
Star*Tech Journal is an authorized Beckman distributor.
-------------------------~---------------------

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