Star Tech Journal

Issue: 1981-September - Vol 3 Issue 7

Modification of One Coin-One Play Machine
Into Two Coin-One Play Machine
byAsraphAII
Single coin operated machine can be modified into two coin operated machine
using Flip-Flops. The fig-1 shows micro-switch connections of the coin
mechanism. The modified circuit for two coins is shown in fig-2.
The flip-flops are used for dividing action. In addition, the
circuit uses a miniature relay which has two normally open
contacts. The first one supplies coin pulse to the machine
and the other one resets the flip-flops immediately
after the coin pulse is supplied.
WILLIAM
s
"DEFENDER"
N
0
T
s
E
........_ _ _ _ _ _ _ _ _ _ _ _ _ ..- by Todd Erickson-. _ _ _ _ _ _ _ _,...-------..-~
This first attempt at a video
game for Williams has produced a major contender for "Game
of the Year." The game is well made and basically trouble free.
There are only three minor
problems with the game. The first is the back door interlock
switch. The back door is made of plywood and may warp. It
would be advisable to place a screw in the back door to hold
it tight, adjacent to the switch. Pinball shooter tips are also a
help on the switch or a piece of foam or spring on its back
door. The next problem is the air vent on the top of the
cabinet. In a few locations where spillage of a beverage is a
problem, I feel a handle of wood can be placed over the vent.
An upside down U shaped handle would work well and not
interfere with cooling. The last problem is quite liveable. The
production coin box is quite large. Care must be taken when
removing it from the game, due to the weight of the box. I
don't like the fact that divisions are missing in the box for
Susan B. Anthony coins. The first two problems will be cured
with their next game and the last problem will probably
remain.
0

~~~;l~~~~~~~1i'1~}'~--f.flt 1 ~.1<1'.•=.~t'.*';,tif~~'.J.',c,c'.-;:1ii:;lt?:?.>c, , , ....... ,-,-!. , ..
AMERICAN ARCADE
TECHNICAL ACADEMY
(Formerly American Arcade School)
The following boards are
interchangeable between
the four card rack system
games; (" Extra Bases",
"Space Zap", "Gort" and
"Wizard of War")
* Ram PCB's
* CPU PCB
* Pattern PCB
The following boards are
unique to each game;
* Rom/Ram PCB
* Game PCB
*In depth instructions on solid state game equipment.
*Guest lecturers from major game factories. Concise 6 day
course, including text books and technical manuals.
*Lecture sessions and in shop training directed by Don
Wright, formerly Chief Technician at Cinematronics.
*Limited space available-Sessions will be held on the second
Monday of every month through the following Saturday.
4607 Mission Gorge Place
San Diego, CA 92120
Call now for information
In California
(714) 287-4263
Nationwide
1-800-854-2 521
Credit Cards Accepted
SHJ SEPTEMBER 1981 7

Download Page 6: PDF File | Image

Download Page 7 PDF File | Image

Future scanning projects are planned by the International Arcade Museum Library (IAML).

Pro Tip: You can flip pages on the issue easily by using the left and right arrow keys on your keyboard.