Re: Monochrome VGA?

Article View: alt.msdos.programmer

Article #656

Back to alt.msdos.programmer Previous Next

#656

From: Jerzy Tarasiuk
Date: Tue, 29 Sep 1992 13:21

14 lines
1504 bytes

>>>>> On 25 Sep 92 18:40:52 GMT, dspascha@eos.ncsu.edu (DAVID SCOTT PASCHAL) said:
DAVID> Hi.  256K colors means 64 shades each for red, green, and blue.  Unless you've
DAVID> got a really fancy monochrome VGA monitor, the monitor will only look at one
DAVID> of those signals (I think green for the IBM VGA monochrome monitor).

I suppose the card has analog outputs for Red, Green and Blue. Can add few
resistors and connect it to analog input mono monitor and get more shades
than eye can distinguish (how many gray shades you can distinguish ?
using resistors can get different shade for each of these 256k colors if
we don't consider noise which is surely bigger than 1/256k of signal but
it makes no sense to try display so many shades... just use two resistors,
one few times less than input impedance of monitor and second several times
bigger than the input impedance, connect one end of each to VGA outputs and
second to monitor input, you will get about thousand shades).

Technical Details

Message-ID: <JT.92Sep29142158@fizyk1.fuw.edu.pl>

Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!sunic!fuw.edu.pl!cocos!jt

References: <19u3voINN8l9@chester.ksu.ksu.edu> <1992Sep25.184052.13247@ncsu.edu>

Show Full Headers

Complete Article Headers

Newsgroups: alt.msdos.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!sunic!fuw.edu.pl!cocos!jt
From: jt@fuw.edu.pl (Jerzy Tarasiuk)
Subject: Re: Monochrome VGA?
In-Reply-To: dspascha@eos.ncsu.edu's message of 25 Sep 92 18:40:52 GMT
Message-ID: <JT.92Sep29142158@fizyk1.fuw.edu.pl>
Sender: news@fuw.edu.pl
Nntp-Posting-Host: fizyk1
Organization: Warsaw University Physics Dept.
References: <19u3voINN8l9@chester.ksu.ksu.edu> <1992Sep25.184052.13247@ncsu.edu>
Date: Tue, 29 Sep 1992 13:21:58 GMT
Lines: 14

Reply to Parent Message