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From: phil@pepsi.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc,comp.sys.ibm.pc.programmer
Subject: Re: VGA standard (and Turbo C)
Message-ID: <1990Jun29.194631.29214@amd.com>
Date: 29 Jun 90 19:46:31 GMT
References: <13360@megatest.UUCP>
Sender: usenet@amd.com (NNTP Posting)
Organization: Advanced Micro Devices; Sunnyvale, CA
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In article <13360@megatest.UUCP> bbowen@megatest.UUCP (Bruce Bowen) writes:
|
|it appears that, with their bgi VGA driver, I can only have 16 colors on
|the screen at any one time, although I am able to change the color
|pallette and access a broad range of colors.  Is this a limitation of
|the VGA standard?  If so, how do programs like "cshow" work, that
|accuratly display a much greater than 16 color image on the monitor?

The IBM VGA can only display 16 colors in its highest resolution
mode (640x480). You have to go down to 320x200 to get 256 colors.
The cloners provided extended resolution modes, and they all did
it in a different way. 640x480x256 is a non-standard mode. CSHOW
does it by having drivers for each different board. I assume that
Borland did not provide support for 320x200x256 mode, or the
structure to allow drivers for extended VGA modes.

--
Phil Ngai, phil@amd.com		{uunet,decwrl,ucbvax}!amdcad!phil
PALASM 90: it's not the same old PALASM any more!