Path: utzoo!attcan!uunet!motcid!koch
From: koch@motcid.UUCP (Clifton Koch)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Mono Monitor with VGA card?
Message-ID: <4425@navy22.UUCP>
Date: 13 Aug 90 18:23:55 GMT
References: <1990Aug10.203858.15781@wolves.uucp>
Distribution: comp
Organization: Motorola Inc., Cellular Infrastructure Div., Arlington Heights, IL
Lines: 27

From article <1990Aug10.203858.15781@wolves.uucp>, by terry@wolves.uucp (Terry L Parker):
>>In article <6053@hub.ucsb.edu> 6600kjp@ucsbuxa.ucsb.edu (Kevin Phillips) writes:
> 
>>MDA and HGA compatible monitors are called "TTL monitors", for the
>>interface they use.  (Only monochrome monitors have this kind of
> There are monochrome TTL monitors, but CGA and EGA monitors are 
> RGB.

TTL refers to the voltage thresholds used to send the video information
to the monitor.  RGB means that each color has a different signal(s) to
control it.  Both CGA and EGA monitors are both RGB and TTL.  VGA is an
an example of RGB and analog.

> 
>>are.)  TTL monitors can't display shades of gray.  VGA cards need
> 
> That is incorrect.  TTL monitors are capable of displaying shades of
> gray.  I used an ATI EGA Wonder on my TTL mono monitor for two years
> and it displayed the EGA colors as shades of grey just fine.  It is
> not a limitation of the monitor, but most video cards.

The monitor merely turns the color information from the card into shades
of grey.  The card has little to do with it unless you're shooting for
some sort of compatibility mode.  It's the monitor which has to make sense
of the incoming signal.

Cliff Koch