Re: A83: moving background

Re: A83: moving background

• To: assembly-83@lists.ticalc.org
• Subject: Re: A83: moving background
• From: Olle Hedman <oh@hem.passagen.se>
• Date: Thu, 16 Jul 1998 20:49:44 +0100
• Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
• In-Reply-To: <yam7501.200.275579016@smtp.softhome.net>
• References: <199807160146.SAA18345@scv.net>
• Reply-To: assembly-83@lists.ticalc.org

Remove the ld b,0 's  and get it a little bit faster :)

//Olle

>
>Just rotate every byte in the graph buffer through carry, like this:
>
>        ld    hl,PLOTSSCREEN
>        ld    b,0
>loop1:  rr    (hl)
>        djnz  loop1
>        ld    b,0
>loop2:  rr    (hl)
>        djnz  loop2
>        ld    b,0
>loop3:  rr    (hl)
>        djnz  loop3
>        ret
>
>That's optimized for speed, optimizing for size would use bc to loop through
>all of the buffer at once. This will scroll everything to the right one
>pixel, leaving the leftmost row trashed.
>
>Linus
>
>

• Re: A83: moving background
• From: Linus Akesson <lairfight@softhome.net>

• A83: moving background
• From: "Chris Hiszpanski" <mecad@scv.net>
• Re: A83: moving background
• From: Linus Akesson <lairfight@softhome.net>

• Prev: Re: Fw: A83: Re: scroll text (for Linus)
• Next: Re: A83: moving background (addition)
• Index(es):
  • Main
  • Thread