Re: A86: _textShadow help

To: assembly-86@lists.ticalc.org
Subject: Re: A86: _textShadow help
From: "Joshua Name" <pcflyer1@hotmail.com>
Date: Mon, 08 Nov 1999 18:21:31 CST
Reply-To: assembly-86@lists.ticalc.org


So it could be used to store things such as the background behind where an 
8x8 is to be placed before it is moved?  How would I accomplish this?  
Should I just read what bits are set in the video memory at that location, 
store it to the textShadow, and then read it back into the video memory 
where it was before when the sprite is moved again?

thanx, pcflyer1@hotmail.com

>From: Chris Phelps <chicane@reninet.com>
>Reply-To: assembly-86@lists.ticalc.org
>To: assembly-86@lists.ticalc.org
>Subject: Re: A86: _textShadow help
>Date: Mon, 08 Nov 1999 13:21:38 -0800
>
>
>DGSLord@aol.com wrote:
>
> > Hey wow I can answer one!
> >
> > I believe that the text shadow is the area where the calculator stores 
>what
> > is currently displayed on the Home Screen.  Since we write directly to 
>the
> > video ram in ASM, we don't need the Text Shadow so we can use it for 
>other
> > things like storing data.
> >
>
>168 bytes I believe.
>make sure you clear it out with _clrScrn when you leave your prog, else you
>might get garbage on the screen.
>
> >
> > You could also use another area  called _plotSScreen which has the same
> > number of bytes (1048)
>
>1024 bytes actually.
>
> > as the video ram.  This is where the calculator stores
> > what is displayed on the graph screen if you don't happen to be looking 
>at it
> > at the moment.  If you use grayscale, this is your second viewing 
>plane., but
> > if not, you can use it to store data.
>
>

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