> To my knowledge > it's in this order 80,81,82,85,92,83,86. Definitely not. The 80 made the 81 obsolete. Even more than the 83 did the 82. Enough that the 81 is the only discontinued calculator on the list. The 85 came before the 82. And I think the 92 came even before the 81, but don't hold me to that last one.