Star Tech Journal

S*TJ
MARCH 1981
4
Midway
'' Pac-Man"
Ram/Rom
Location Code
The following charts will identify,
while in "self-test", the location
of the failed device.
BAD ROM LOCATION CODE
Display
Location
M-Rom-0
M-Rom-1
M-Rom-2
M-Rom-3
6E
6F
6H
6J
BAD RAM LOCATION CODE
Dlsplay
Location
4K
4N
Bad VRam-0
Bad V Ram-1
Bad C Ram-0
BadC Ram-1
BadWRam-0
BadWRam-1
41
4P
4M
4R
0
Atari
''Missile
Command"
Power
lntem1pt Mod
Problem:
Random number of credits are
generated resulting from power
interruptions (e.g. repeated
switching of on/ off power switch,
repeated plugging/unplugging
of game into AC outlet).
Solution:
Change IC 7493 located at D4
to 7 490 and ground pins 6 and
7 (counter reset circuit).
Atari
"Battlezone"
Random Score
Problem
Atari's "Battlezone" will from
time to time generate an
exceedingly high score when
a player is about to enter his
initials in the "High Score
Table". Although this
problem is a nuisance, it
does not affect the game's
earning power. Atari
engineers are looking into a
solution for this problem. •
According to Bernie Barranger of Atari's
Customer Service Department, this fix
will substantially reduce the chance of
credit accumulation upon power
interruption.
OPERATORS!
MECHANICS!
Are you searching for a painless way to upgrade your ability to repair the
Electronic games you operate .. . the games you depend on for your
livelihood?
SAN DIEGO ARCADE SCHOOL ...
offers 46 hours of comprehensive , practical training in electronic amuse-
ment repair for mechanics and operators.
YOU DON'T NEED AN OSCILLOSCOPE ...
to be successful at repairing Solid-State games. The course stresses the
efficient use of test equipment like the Logic Probe and Digital Multimeter;
relatively inexpensive equipment that operators and mechanics can easily
afford .
A transistor protected by
a fast-acting fuse will
protect the fuse by blowing
first.
IS THE COURSE EXPENSIVE?
Not really . The tuition fee of $350.00 includes over $75.00 worth of
textbooks , databooks, and other materials!
San Diego Arcade School will not teach you how to repair a jukebox,
electromechanical pinball or vending machine. You will learn about diodes,
transistors, power supplies, electronic pinball , video games (including a
special session on video games that use the X-Y monitor system), cross
referencing semiconductor replacement parts , using a logic probe , and
more.
San Diego Arcade School• 6123 El Cajon Blvd.
San Diego, California 92115 • (714) 286-0172