A86: Re: Gray Scale

To: <assembly-86@lists.ticalc.org>
Subject: A86: Re: Gray Scale
From: "Matt Johnson" <matt2000@gte.net>
Date: Wed, 22 Jul 1998 11:53:01 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


Hmm.. you can replace the bit 1, a with the 'AND' instruction when you are
checking the VBL int. Also, why do you save the last 6 bytes of plotscreen?
Shouldn't you be saving the 6 bytes after plotscreen since when you write
1024 bytes starting at $CA00 (I think that is it off the top of my head) you
overwrite 6 unknown bytes past _plotScreen + 1024

Later,
    Matt

>I improved the gray scale in this routine and it is now as flickerless
>as the z80 is capable of.  There is only a small flicker when the
>batteries are very low.  I also commented it.

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