Which calculators had no known bugs?

[[kby]]

(11-19-2020 10:07 PM)Gene Wrote:  The HP-27 has Y^X on the second row, last button on the right.

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Doh! Guess I was looking too hard for a shifted function. Seems to be shifted on Classics and Woodstock’s after -35, but mixed on the business calls that have it: 70, 80 and 27 are unshifted; 22 is.

Anyway both the 22 and 27 have the newer algorithm that give correct answer for 2**n and also allows negative bases with integral exponents.
-kby