Re: [stella] Animating the Marbles

Subject: Re: [stella] Animating the Marbles
From: Chris Wilkson <ecwilkso@xxxxxxx>
Date: Wed, 3 Jul 2002 13:51:14 -0400 (EDT)
On Wed, 3 Jul 2002, Paul Slocum wrote:

> The problem is that to display it at the top and bottom I need roughly 140
> empty bytes above and below the marble image.  That's fine, except there's
> no way to do it without indexing across a page boundary, which causes an
> extra cycle on each line.  My kernal totally breaks with an extra cycle per
> line.

It's been a while since I could look at this game, so I'm sorta taking the
above out of context.  But when you're reading the graphics data, if you
could reverse the indexing direction depending on wether you're at the
top or the bottom, you'd only have to store 140 empty bytes instead of
280.  That would make a total of 156 (I think) which fits in a single
page.  So you only need one copy and would save tons of space.


Archives (includes files) at
Unsub & more at

Current Thread