Re: A86: Re: sprites

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Re: sprites
From: Dux Gregis <assets@eden.rutgers.edu>
Date: Tue, 19 May 1998 01:59:23 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <006201bd82d2$7883f9a0$ddf3ffd0@matt> <3560F8BF.4945B4EE@eden.rutgers.edu>
Reply-To: assembly-86@lists.ticalc.org


I figured it out ... the a reg was being destroyed.
Feel free to use this routine, it's about 40% faster than the copy sprite
algorithm in Trent's tutorial, and about 3 times faster than what bioserrors just
posted  :-)

;Input = sprite size in bc, video mem location in hl, sprite location in de

 ld bc,8                   ;sprite size
the_loop:
 ldi
 ret po                       ;return when bc is 0
 ld a,e
 add a,15
 ld e,a                       ;add increment to e
 jr nc,the_loop
 inc d
 jr the_loop

Follow-Ups:

Re: A86: Re: sprites

From: Dan Eble <eble@cis.ohio-state.edu>

Re: A86: Re: sprites

From: David Phillips <electrum@tfs.net>

References:

Re: A86: Re: sprites

From: "Matt2000" <matt2000@gte.net>

Re: A86: Re: sprites

From: Dux Gregis <assets@eden.rutgers.edu>