[stella] Star Fire 2600: Star Background

[Manuel Polik <cybergoth@xxxxxxxx>]

Hi there!

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.

Please ignore the increasing stars flicker towards the 
right edge of the screen, I'll *time* most of that away, 
as soon as I'm done with adding features to the kernel.
Unlike my first assumption, flicker can't be totally 
avoided, since there's no way to enable the ball during 
a repositioning line.

I've still a few cycles left (~6 on each line, + one STA 
WSYNC eventually) so I'm positive at the moment about 
having non-mirrored sprites, which'd allow me adding the 
mothership in its original fashion.

Greetings,
	Manuel

Attachment: paulstar.bin
Description: application/macbinary

Attachment: paulstar.s
Description: Binary data