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From:	"Marp" <marp AT 0 DOT 0 DOT 0 DOT 0>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Question about movedata
Date:	Mon, 18 Feb 2002 21:38:58 -0500
Organization:	MindSpring Enterprises
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"Captainpita" <captainpita AT aol DOT com> wrote in message
news:20020218212013 DOT 13574 DOT 00003023 AT mb-mv DOT aol DOT com...

<snip>

> source_selector = _my_ds();
> movedata(source_selector,tempd,0XB800,x,len);
>

<snip>
>
>  x is the offset into the color video area that starts are 0XB800
>  len is how many bytes to move
>
>   What did I hose up?   Any ideas out there?

The problem is is that 0xb800 is not a selector for the area of memory
you're trying to access. DJGPP provides a selector (called _dos_ds) you can
use for this purpose. You must also convert the segment:offset pair into a
linear address using the formula segment * 16 + offset.Your function call to
movedata should look more like this:

movedata(source_selector, tempd, _dos_ds, 0xb800 * 16 + x, len);

You can replace 0xb800 * 16 with 0xb8000 if you wish.

Hope this helps.

>
> Confused in Vermont
>
>
>

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