[stella] Battlezone "Crash" analysis

[Manuel Polik <cybergoth@xxxxxxxx>]

Happy Halloween everybody!

Ok, I'm done with analyzing how the "Crash" scene is 
done in Battlezone. 

Basically just some random *noise* is produced over the 
essential registers for P0/P1/M0/M1. Once everything is 
*seeded*, just some 165

STA WSYNC
STA HMOVE

are executed, to finish the screen.

Attached is my partial reverse-engineering, focusing on 
that effect only.

It will compile into a bit-perfect NTSC 8K Battlezone, 
so it will at least save you any 8K Distella troubles 
;-)

The variable names I "found" will work fine for the 
understanding of the trick, though in the context of the 
whole game, their meaning might be slightly 
different/enhanced.

For the rest of the day I decided to celebrate Halloween 
with playing Diablo 2, so you've to wait until tomorrow, 
if you'd like to see the effect in Star Fire :-)

Trick or Treat,
	Manuel

Attachment: battle.zip
Description: Zip archive