STAR*TECH Journal
November 1993
KONAMI
LETHAL ENFORCER
GUN DISCREPANCY
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Ali Birjandi
Head of Research & Development
Leisure & Allied Industries
Perth, Western Australia
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I am amazed at the technical
description of the optical guns
that are used on Lethal En-
forcer. It is incorrect in its ba-
sis as the gun is a "receiver"
not a "transmitter".
feterenceS/.
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>po Boxl065 · •
Merchantville, NJ
> 08109 / 609 / 662-1080.
I agree that the opto-schmitt
receiver is not able to pick up a
deteriorated signal from the
CRT, but a replacement device
can be inserted into the gun
modularly, with a high ampli-
fication to overcome the prob-
lem.
The guns work on the principle
of picking up the electron
beam as it scans past a point at
which the gun is aimed. This
information is then fed into
the software, via a hardware
interface as an X/Y co-ordi-
nate. Accurate locating of the
point-of-aim is accomplished
by knowing exactly which part
of the screen is being drawn at
the time that a signal is re-
ceived. This is very simple as it
involves only adding a coupfo
of latches to the circuit that
generates the video image in
the first place (or within the IC
responsible for CRT opera-
tions).
There is no possible way for a
standard CRT monitor tube to
detect any kind of incoming
signal as the CRT is an output
device only.
All light guns currently work
along similar principles and
have the added advantage of
not drifting due to pots becom-
ing loose and also do not re-
quire extensive calibration, as
well as being more reliable
(service wise) due to solid state
componentry.
I acknowledge all other points
in the article as being factual.