Date:	Thu, 30 Dec 1999 09:42:06 +0200 (IST)
From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender:	eliz AT is
To:	sl <junk AT bbs DOT darktech DOT org>
cc:	djgpp AT delorie DOT com
Subject:	Re: VESA 1.2, cannot get current video mode!
In-Reply-To:	<fyoofqnexgrpubet.fniwtx0.pminews@nntp.generation.net>
Message-ID:	<Pine.SUN.3.91.991230094149.20984K-100000@is>
MIME-Version:	1.0
Reply-To:	djgpp AT delorie DOT com
X-Mailing-List:	djgpp AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

On Wed, 29 Dec 1999, sl wrote:

> 	Using the VESA 1.2 specification (I also double checked using the MS
> DOS interrupt list) I wrote up the following function.. Unfortunately, on my
> system, this call ALWAYS returns regs.h.al=79 instead of regs.h.al=0 which
> would indicate no error has occured.

79 decimal is 4F in hex, which means VESA is unsupported on your
system.

>    regs.x.ax=0x4F03;
>    regs.h.ah=0x4F;
>    regs.h.al=3;

You only need the first line, the other two are redundant.

>    if (regs.h.al!=0x4F)
>      setError(noSupport); //command not supported

This is backwards: you need to say this:

     if (regs.h.al == 0x4F)
       setError(noSupport); //command not supported

- Raw text -