From: "KB" 
Subject: Re: VESA video modes
 
 
 
Marc van den Dikkenberg  wrote in
article ...
> On Mon, 23 Mar 1998 22:21:43 -0500, Robert Severn 
> wrote:
>
> >To set a VESA video mode, you have to set AX = &H4F02 and then put the
> >video mode (&H111, &H114...) in BX.  Then do the INT &H10.  As far as
> >actually doing anything in these modes, I know how to set pixels in the
> >256 colour modes (that's easy, just write bytes to the video buffer) but
> >as for the high colour modes I don't know how the pixels are stored.  So
> >if anyone does, let me know.
>
> I've been playing around with the hi-color modes for a little while now,
> and did figure out that part. Hope this helps:
>
> In a 16-bit mode, you have to poke two bytes for one pixel.
> the first 5 bits are the red value, then 6 bits for green, and 5 bits for
> red again.
>
> &B RRRRRGGG
> &B GGGBBBBB
>
> In a 16-million color mode, you have a byte for each of the colors.
> However, there seems to be a fourth byte of which I havne't found the
> use yet. Probably just stuffing:
>
> &B RRRRRRRR
> &B GGGGGGGG
> &B BBBBBBBBB
> &B ??????????
>
> So you poke 4 bytes for each pixel.
>
>
> --
> Marc van den Dikkenberg
> -----------------------
> The PowerBasic Archives
> http://www.xs4all.nl/~excel/pb.html
>
 
Wow, does this mean that 24bit mode is actually 32bit?
 
KB
 
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