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From: osmoviita@cc.helsinki.fi
Newsgroups: comp.os.msdos.programmer
Subject: Re: MSDOS monochrome displays?
Message-ID: <1991Apr6.201634.5868@cc.helsinki.fi>
Date: 6 Apr 91 20:16:34 GMT
References: <3586@naucse.cse.nau.edu> <1399@bragi.ctron.com>
Organization: University of Helsinki
Lines: 24

In article <1399@bragi.ctron.com>, dj@bragi.ctron.com (DJ Delorie) writes:
> In article <3586@naucse.cse.nau.edu> rrw@naucse.cse.nau.edu (Robert Wier) writes:
>>
>> OK, I'm confused.  I have a situation where I'd like to display
>> monochrome graphics in at least 16 shades of gray, preferably
>> 256 shades of gray.  This is data received from the GOES series
>> of weather satellites.
....
> 
> A VGA can display up to 64 greys at a time, as it's palette has six
> bits per color, regardless of the type of VGA monitor you attach to
> it.  This still gives you 192 pixel values left in 256 color mode to
> do simulated color if you want.  Of course, 16 greys in 16-color mode
> is no problem for VGA.
> 
> DJ
> dj@ctron.com

Some newer SuperVGA cards like Orchid ProDesigner II have 6/8 bit DACs, so
they should be able to show 256 shades of gray if you know how to switch
from 6 bit mode to 8 bit mode. I don't know and if someone can tell please
do it. Orchid PD II is a Tseng ET4000 based card.

Kari Osmoviita