On Sat, 4 Aug 2001, Reuben Reyes wrote: Whatever you can get someone to pay for it. Oh, you mean historically? It's a very interesting programmable calculator. Here's another terrific article by Rick Bensene on his Old Caclulators Web Museum about the 31 that will answer many of your questions: http://www.geocities.com/SiliconValley/Lab/7510/tek31.html Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org