Author: Krill/Plush
System: Commodore 64
Language: Commodore 64 Basic V2
Length of source code: 78 characters to type in (119 characters if compatible with petcat, 126 characters for petcat without short commands)
Length of executable file: 76 bytes
Instructions on how to run the code: Install vice, drag and drop the prg file into it (x64sc)
How it works: it turned out to be disappointingly conventional code, really. look at it once and you'll understand.