[A83] Re: greyscale

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: greyscale
From: "SUCKER from the old days" <sucker_pvn@hotmail.com>
Date: Fri, 21 Dec 2001 13:01:46 +0000
Reply-To: assembly-83@lists.ticalc.org


>At 20:46 2001-12-20, you wrote:
> >It's different lcd drivers. We've talked about this before, but this is 
>the
> >basic idea:
> >the 89 has a method that tells the driver that it is time to update
> >on the 83, the driver is independent of the calc(and this varies 
>depending on
> >how new the batteries are).
> >
> >Thats why the 89 has 7 scale grey scale and we only have 2 colors :P
>
>Yes.
>But suckers idea is still right. On the 89 for 4 level gray you basicly
>have two buffers for the screen contents, and on an interrupt, you switch
>between the two. 2/3 of the time it displays one buffer, 1/3 of the time
>the other.
>(there is other switching schemes but this is the most simple)
>The 89 lcd driver has a port where you set from which adress in memory to
>read the screen contents.
>
>///Olle

Nice!!
That's incredibly usefull!!
Too bad the 83 series don't have that...

         SUCKER

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