When I happened across the source code and saw the byte patterns for the
graphics
, I knew I had to see what it would look like on a Commodore 64 so I mocked up the sprites and character based background graphics using the online PETSCII editor and then used the export to generate the 6510 machine language to display the graphics.
The generated machine language from the PETSCII editor is a great starting point for a demo without writing any code up front and is well commented.