Kiwi's Blog - Scroll screen

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I constructed this scroll screen via programming. Here how I made this screen.

 

 

static void ScrollScreen(void)

{

byte x; //declare x

rle2vram(PATTERN2RLE, 0x0400); //pour pattern data into char 128-384(my letters are in char 0-127)

rle2vram(COLOR2RLE, 0x2400); //pour color data after my letter's color which is in 0x2000-2400

 

fill_vram(0x1800,0x9D,768);//fill screen with solid yellow tile

fill_vram(0x1800,0x98,1);// draw 1 left roller

fill_vram(0x1801,0x9a,30);///draw 30 tiles with the = tile

fill_vram(0x181f,0x99,1);//draw 1 right roller

 

x = 0; // x equal zero

while (x<22) {//loops this nest until x is at 22

fill_vram(0x1820+x*32,0x90,1);

fill_vram(0x1821+x*32,0x9B,1);

fill_vram(0x183E+x*32,0x9C,1);

fill_vram(0x183F+x*32,0x90,1); draws paper edge

 

x++; add 1 to x

}

 

 

 

fill_vram(0x1AE0,0x98,1); draws bottom rollers.

fill_vram(0x1AE1,0x9a,30);

fill_vram(0x1AFF,0x99,1);

}

 

http://www.atariage.com/forums/blog/340/entry-7365-scroll-screen/