[A83] Re: How do I erase a non-XORed sprite?

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: How do I erase a non-XORed sprite?
From: Patai Gergely <patai.ti@freemail.hu>
Date: Tue, 29 Jan 2002 18:26:30 +0100 (CET)
In-Reply-To: <117.ba4b290.29876af3@aol.com>
Reply-To: assembly-83@lists.ticalc.org


> I modded ion's putsprite to be ORed, but I can't erase 
it? I've tried masking 
> it, and just drawing a blank over it... Now what do I do 
to erase it?
You will never delete anything with OR, because its truth 
table will always give one if any of the bits of its input 
are set. You have to use AND. Set the bits you want to 
preserve, and clear those you want to see cleared in the 
final screen.

PG

References:

[A83] How do I erase a non-XORed sprite?

From: Xempest@aol.com

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