Re: A83: buffer magic

To: assembly-83@lists.ticalc.org
Subject: Re: A83: buffer magic
From: Stefan Lennartsson <stefan@infinity.hemmet.s-hem.chalmers.se>
Date: Thu, 28 Jan 1999 20:20:12 +0100 (CET)
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-83@lists.ticalc.org
In-Reply-To: <000501be4a5b$2a4cace0$7f38d5cf@default>
Reply-To: assembly-83@lists.ticalc.org


BC is decremented until it reaches zero so the 768 bytes stored at logo
will be in plotsscreen after the ldir, _GRBUFCPY_V copies plotsscreen
to the display

/Stefan

On Wed, 27 Jan 1999, Man in the Moon wrote:

> 
> Could someone please explain to me how this standard piece of code that
> displays a picture works? Why increament bc? It will neve reach zero using
> ldir. Why use hl, de, and bc, three varibles which appear to have nothing to
> do with each other.
> 
>  ld hl,logo
>  ld de,$8e29
>  ld bc,768
>  ldir
>  call _grbufcpy_v
> 
> From: Chris (Man in the Moon)
> man_in_the_moon@usa.net
> 
> 
> 
>

References:

A83: buffer magic

From: "Man in the Moon" <man_in_the_moon@usa.net>