First time I tried this, I followed the guide in The Robot Book by Richard Pawson which was difficult as the photos are in black and white. However, like most publications in the 1980s involving type in listings, there are mistakes in there that control the C64 userport. This time around I do things differently and work through every part logically, with a much happier ending.
You can find the robot book if you type in a google search for it. Achive has a copy of it to view that is weirdly missing a number of pages including this project but there are other projects in there for the BBC model B etc, worth checking out.
Music by Urban Jaguar - Priority Beat - https://thmatc.co/?l=495569EB