Re: A86: Re: GrayScale Confusion

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Re: GrayScale Confusion
From: Dux Gregis <assets@eden.rutgers.edu>
Date: Sun, 26 Jul 1998 01:06:16 -0600
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <001701bdb76a$416b2840$abf4ffd0@gte.net.gte.net>
Reply-To: assembly-86@lists.ticalc.org




Matt Johnson wrote:

> Well.. I dont feel like figuring out the Putsprite but doesnt a grayscale
> Putsprite need at least 16 bytes? You need two sprites to form a grayscale
> sprite
>
> Also, 1 just means one. If you want all the bytes filled, you use $FF or
> 255. 1 will just draw a right line, because 1 is %00000001 and it is 1
> bit/pixel per sprite. Two sprites yields 2-bits/pixel or 4 shades.
>
> If people think my tutorial wasn't informative could someone give me a few
> pointers to clarify the grayscale section? I would assume that the animated
> gif and the commented source code was enough.. but.. maybe not. What more
> could I add to increase its clarification? I didn't add a grayscale
> putsprite, because you would only need two putsprites to draw a grayscale
> sprite.

PutSprite only puts to video memory.  You can't call PutSprite twice and expect
the second call to put your sprite to $ca00.  I have a GrayScale PutSprite
Routine on my web page (http://www.eden.rutgers.edu/~assets/ti86.htm).  I've
never actually tested the routine, but there's no reason why it shouldn't work.

Follow-Ups:

Re: A86: Re: GrayScale Confusion

From: Bryan Rabeler <brabeler@isd.ingham.k12.mi.us>

References:

A86: Re: GrayScale Confusion

From: "Matt Johnson" <matt2000@gte.net>