Re: [stella] Star Fire 2600: Star Background

Subject: Re: [stella] Star Fire 2600: Star Background
From: Thomas Jentzsch <tjentzsch@xxxxxx>
Date: Thu, 1 Aug 2002 09:16:48 +0200
Manuel wrote:
> Ok, as promised, here's finally a binary with some star 
> background, using an adopted technique which I analysed 
> by studying the code from Earth Dies Screaming.

Looks really good. :-)

> Unlike my first assumption, flicker can't be totally 
> avoided, since there's no way to enable the ball during 
> a repositioning line.

Maybe some optimizing in the kernel will help. What are the 
timing critical paths? Repositioning?

you are doing this to set the shape-pointer:

    LDY sprtsizetype,X
    LDA shapeptrtab,Y
    STA tieshapeptr     ; Set space object pointer

Why don't you do the first part *outside* the kernel? That would require 
some extra memory, but you are not short of that anyway.

That would save you a lot of cycles inside the kernel.


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