[stella] Nick's PlayField Graphics Demo: Question

Subject: [stella] Nick's PlayField Graphics Demo: Question
From: "Roagie" <roagie@xxxxxxx>
Date: Wed, 10 Jul 2002 20:13:01 -0700
This is from Nick's playfield demo that scrolls 'hello' up the screen.


What do these two statements do? 

Temp       = $80
PlayfieldY = $90

here is where they're placed in the code:

************************************************
        processor 6502
        include vcs.h

        org $F000

Temp       = $80
PlayfieldY = $90

Start
        SEI 
<code continues...>
************************************************

Thanks

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