This was kinda fun. Though I will note that post-1990 Hewlett Packard graphing calculators were also RPN, like my HP 48G+. So that part of the test is a little off. I answered pre-1990 just because it is RPN. Those are fantastic calculators!!!
Oh, and I handed in a paper today. Woo hoo. And stuff. 16 pages of it, anyway.