Hmmm. Interesting. I wonder if I can remember enough
BBC BASIC to
 implement a very crude Lisp in it. :_D 
 Since my first exposure to Pascal was via the 3-part Tiny Pascal article
 in BYTE, where a subset compiler was written in NorthStar BASIC, that
 would be very interesting. 
 
 Is this around anywhere? That sounds delightful.