From: Neil Goldberg <ngoldber AT mitre DOT org>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: vga vs VESA with gnuplot
Date: Thu, 12 Aug 1999 08:59:45 +0100
Organization: The MITRE Corporation
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To: djgpp AT delorie DOT com
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Jeff Williams wrote:
> 
> I'm using the djgpp port of gnuplot---it's very nice.  The readme.dj2
> doc says that two options (among others) for the GRX20DRV environment
> variable (used by the GRX-2.3 graphix library) are
> 
> SET GRX20DRV=VESA  gw <width> gh <height> nc <colors>
> 
> SET GRX20DRV=stdvga  gw <width> gh <height> nc <colors>
> 
> OTOH the `set terminal' command in gnuplot accepts `svga' but
> does not recognize `VESA'.
> 
> Can someone explain to me the difference between stdvga and VESA
> (I know what the acronyms stand for :), and when one would be
> preferred over the other?
stdvga (standard VGA) allows screen modes that do not exceed more than
256k in size, like the famous 320x200x256 color mode 13h.
Or Windows 95 start-up screen Mode X VGA 320x400x256.

VESA is a graphic interface extension that allows you to use the
extended features of your video hardware without anything Windows
related.
This is usually accomplished through a BIOS extension (see note 1) or
software (like Scitech Display Doctor).

> 
> The only video driver information I can provide is what I see
> at boot time:
> 
> CL-GD6420 VGA BIOS Version 1.01 alpha4
> Copyright 1992 Cirrus Logic, Inc.  All Rights Reserved.
> Copyright 1987-1990 Quadtel Corp. All Rights Reserved.
> 6420 04/22/92
Not interesting...
> 
> CLVESA, Cirrus Logic VGA VESA BIOS Extension Version 1.00
> Copyright (C) Cirrus Logic Inc., 1992.  All Rights Reserved.
> Cirrus VGE VESA VBE successfully installed.  (2,010 bytes)
(NOTE 1): This is the VESA support you have natively through BIOS.
Version 1.00 is not exciting, and gnuplot may require the niftier
Version 2. I suggest you check that requirement and that you get Scitech
Display Doctor (www.scitechsoft.com) so you will get VESA 2 or maybe
even VESA 3 support. Even if gnuplot doesn't required VESA 2 and it's
due to some other problem, get Display Doctor anyway, it's good stuff.

moogla
> 
> TIA---jtw