Hello! I own a book written by Lee Correy, whose actual name is G. Harry Stine. That book is "Star Driver". For the curious I can supply a synopsis. In it they mention a microcomputer and they wrote a program in BASIC for handling a heck of a lot of complicated mathematical issues. One of the characters does own a classic programmable calculator for comparison. They were able to make both ideas work by the way for solving the problems in the theme of the book. Now the question, the book is copyrighted 1980, which means the author was writing it over a three year period leading up to that point in time. Is there a list someplace that tells what systems were available then? ---- Gregg C Levine gregg.drwho8@gmail.com "This signature was once found posting rude messages in English in the Moscow subway."