[stella] Marble Craze kernal

[Paul Slocum <paul-stella@xxxxxxxxxxxxxx>]

Aside from the score and status display, my Marble Craze kernal is 
working!  My previous releases were nice, but I cheated a bit by using the 
Stellar Track text code.  But now I'm finally a true 2600 programmer.  :o)

It's going to be a side by side split-screen two player game where you roll 
a marble along a path across multiple screens to a finish line.  It's an 
overhead view, and I also wanted the path to have ramps up and down so I 
added the ability to make the path lighter or darker in places.  There are 
also power ups which I just used a missile graphic for.  And it's a paddle 
game where each player uses two paddles, so I had to add code to read all 
four paddles.  The paddle reading is low-res compared to other games (only 
reads 25 unique positions at 30Hz) but I think it will be fine for this 
game.  The playfield garbage under the score is showing the paddle positions.

-Paul

Attachment: marble.bin
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