Re: A82: Contrast

To: assembly-82@lists.ticalc.org
Subject: Re: A82: Contrast
From: Dines Christy Justesen <c958362@student.dtu.dk>
Date: Sat, 23 Aug 1997 20:09:31 +0200 (METDST)
In-Reply-To: <3.0.32.19960823155701.006ac2e8@dredd.swip.net>
Reply-To: assembly-82@lists.ticalc.org

This has been tried on the TI85, and it works. Just remember to read the
current contrast before chaning it so you are able to return the calc to
the way it was before. Also remember that just writing the new contrast to
the system mem does not change it.

Dines

_______________________________________

Dines Justesen
Email: dines@post1.com or
       c958362@student.dtu.dk
WWW  : http://www.gbar.dtu.dk/~c958362/
_______________________________________

On Fri, 23 Aug 1996, Lars Ahlzen wrote:

> At 10:18 1997-08-20 -0700, you wrote:
> >At 06:11 PM 8/20/97 +0200, you wrote:
> >>Hi!
> >>I want to add a flashing effect to my game, and I figure that using the
> >>contrast would be the most effective way. Does anyone have any routine for
> >>this (I have ROM version 18)?
> >>
> >>
> >>Erik 
> >
> >Check 82-ports.txt for the cool way to do it, there is also a mem address
> >that holds the contrast, I've never messed much with this though. A nice
> >flashing effect can be added by going through GRAPH_MEM and xor'ing each
> >byte with $ff, which will reverse (black pixels->white, white->black) the
> >screen, then do that again to restore it to it's previous state.
> >
> >	-Andrew
> 
> Tell me if I'm wrong, but the contrast could also be used for very smooth
> and nice fade-in and fade-outs, right? I haven't seen it or tried it, but
> it sounds possible to me!
> 
> Lars Ahlzen
> lars.ahlzen@swipnet.se
>

References:

Re: A82: Contrast

From: Lars Ahlzen <lars.ahlzen@swipnet.se>