Re: A86: Fading Routines

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Fading Routines
From: Alan Bailey <bailela@charlie.cns.iit.edu>
Date: Fri, 05 Sep 1997 16:34:03
In-Reply-To: <1.5.4.32.19970905211345.0090f9d0@mail.chipsnet.com>
Reply-To: assembly-86@lists.ticalc.org

At 04:13 PM 9/5/97 -0500, you wrote:
>
>   Would it be possible to do a fade-in/fade-out on the 86 by calling the
>functions to increase and decrease the contrast?  If it would, does anybody
>have the contrast functions?
>
>

this is all you have to do:


-----------------------------------------------------------------------------
port 2 - Contrast, WRITE ONLY
-----------------------------------------------------------------------------

Write - 
    XXX.....
    Value in range of $00-$1F (0d-31d), higher number makes darker

Notes - 
    NO READING FROM THE PORT, however, $C008 contains the contrast, so if
    you read from there, inc or dec it, then load it into the port AND
$C008, all
    will be fine, and your screen will change contrast
    EX:


        ld a,($C008)
        inc a		;or dec if you want to
        ld ($C008),a
        out (2),a

here's the routine ^^^^


-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 Alan Bailey            mailto:bailela@charlie.cns.iit.edu
 IRC:Abalone              Web:http://www.iit.edu/~bailela/
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

References:

A86: Fading Routines

From: Ricci Adams <ricci@chipsnet.com>