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Taking two .BMP files, this program creates a smooth circular window in the "top" picture, allowing you to see the "underlying" picture through the window. The window either moves around automatically, or using the mouse. I've only written the program as Assembly Language enhanced, since the window was very jerky under pure BASIC. With assembler, it's perfectly smooth, making 57,600 calls to a 200-instruction Assembly Routine every time the window moves by just one pixel!
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