Re: A86: Video RAM problem

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Video RAM problem
From: Josh Grams <j3grams@earthling.net>
Date: Mon, 23 Nov 1998 20:18:11 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <cf013eac.365a04d3@aol.com>
Reply-To: assembly-86@lists.ticalc.org


>
>LITTLESTARS:   ;this will put stars in black sky
>  ld hl,%11011111
>  ld ($FC3F),hl
>  ld ($FCB9),hl
>  ld ($FEB5),hl
>  ld ($FF36),hl
>  ld ($FFB9),hl
>  ld hl,%01111111
>  ld ($FD1D),hl
>  ld ($FDA5),hl
>It goes on in the same fashion.

hl is two bytes (16 bits). So when you say
ld hl,%11011111,
what you're really saying is
ld hl,%0000000011011111

That's why you're getting the blank space.

And no, if you want them at specific random-looking locations like that,
there's no easier way. I mean, you'll have at least one instruction per
pixel.

--Joshua

References:

A86: Video RAM problem

From: KidFedX@aol.com

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