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Added few comments and a few new constants
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@ -55,13 +55,20 @@ const byte VIC_CSEL = %00001000;
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const byte* D018 = $d018;
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const byte* D018 = $d018;
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const byte* VIC_MEMORY = $d018;
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const byte* VIC_MEMORY = $d018;
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const byte* LIGHTPEN_X = $d013;
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const byte* LIGHTPEN_Y = $d014;
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// VIC II IRQ Status Register
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const byte* IRQ_STATUS = $d019;
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const byte* IRQ_STATUS = $d019;
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// VIC II IRQ Enable Register
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const byte* IRQ_ENABLE = $d01a;
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const byte* IRQ_ENABLE = $d01a;
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// Bits for the IRQ Status/Enable Registers
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const byte IRQ_RASTER = %00000001;
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const byte IRQ_RASTER = %00000001;
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const byte IRQ_COLLISION_BG = %00000010;
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const byte IRQ_COLLISION_BG = %00000010;
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const byte IRQ_COLLISION_SPRITE = %00000100;
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const byte IRQ_COLLISION_SPRITE = %00000100;
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const byte IRQ_LIGHTPEN = %00001000;
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const byte IRQ_LIGHTPEN = %00001000;
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// Color Ram
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const byte* COLS = $d800;
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const byte* COLS = $d800;
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// CIA#1 Port A: keyboard matrix columns and joystick #2
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// CIA#1 Port A: keyboard matrix columns and joystick #2
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