Star Tech Journal

December 1992
STAR*TECH Journal
MODIFYING MEDIUM RESOLUTION MONITORS
TO ST AND ARD RESOLUTION
Jc1mes Beck
Grec1ter Southern Dist.
Atlc1ntc1, Georgic1
BonoM
QUESTION
Is it possible to tc1ke c1 medium
resolution monitor 2nd down-
grc1de it to c1 stc1ndc1rd resolu-
tion monitor? The c1pplicc1tion
might be useful for c1 conversion.
Whc1t's the difference?
things" in their gc1mes, c1 higher
resolution thc1n the stc1ndc1rd
wc1s needed. The medium resolu-
tion systems c1re the equivc1-
lent of EGA in the IBM world.
MoDIFYit-G
ANSWER
( es, medium resolution moni-
tors differ from the stc1ndc1rd
resolution monitors used in
video gc1mes in c1 couple c1rec1s.
For one, medium resolution
monitors use c1 different hori-
zontc1I frequency thc1n stc1n-
dc1rd resolution monitors. The
reason? Better resolution (of
course).
Yes, you cc1n ( sort of) convert
those medium resolution moni-
tors
to
"stc1ndc1rd"
frequencies.
The ec1siest
wc1y to do it is
by compc1ring
c1 Wells 4915
(MedRes ver-
sion) sche-
mc1tic to the
4902/03
The "c1lmost" NTSC stc1ndc1rd
resolution systems c1re so-so
c1t best for 19" monitors 2nd
c1bsolutely lousy c1t 25" 2nd
c1bove.
:;1c1me designers who wc1nt to
get c1 decent picture c1t 25" 2nd
to show off 211 the "little
(Stc1ndRes
version)
schemc1tic
2nd doing the
c1ppropric1te
c hc1nges to
the horizontc1I
oscillc1tor cir-
cuit.
LINE
The only snc1g is thc1t the yoke
mc1y need to be chc1nged 2nd the
convergence mc1y not be per-
fect. Although it cc1n be done, I
wouldn't recommend it for gc1me
use c1s the dot pitch will never
be exc1ct. Some c1pplicc1tions,
though, might not be fussy
c1bout the shortcomings: such
c1s c1 test set-up, etc.
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