Commodore VIC-20: Basic vs. 6502 Machine Code Demo
A speed comparison between Basic and 6502 Machine Code on the Commodore VIC-20.
The border color is cycled for a white background. This corresponds to cycling register 36879 from 24 to 31. When using machine code the colors are cycled much faster than the computer can redraw the border resulting in the border being filled with many different colored lines.