Danke an forum-64.de für den Hinweis zu PQ1
Ergänzung vom 28.02.17
Dieser Link ist sehr aufschlussreich:
Thanks to Aristides Castiglioni, both Al Lowe and Jim Walls (The creators of the game) were quizzed about the existance of a C64 conversion, and it was news to them. It seems that Sierra only planned for a C64 conversion, so maybe the ASM reviewed version was an unofficial conversion?