This was inspired by my very fond memories of many, many hours spent programming a Commodore Vic-20 and C-64 in the first half of the 1980's and by the surprisingly (?) wonderful book that takes this one line program as its name.
There exists a video of this program running on a real C-64.
Phase II of this fun little project is to make it generate the maze character by character more like the original does (see the video).