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The HP-27 was a hand-held scientific and financial, but not programmable, calculator made by Hewlett-Packard between 1976 and 1978.

Unlike all previous HP's pocket calculators, the HP-27 could do mathematic, statistic and business operations. It used Reverse Polish Notation (RPN) for calculations, working on a four-level stack^{[disambiguation needed]} (x,y,z,t). Nearly all keys had two alternate functions, accessed by a yellow and black prefix key. So despite the 30 keys only keyboard it could access about 68 functions. The HP-27 also had a 10-digit red LED display and 10 registers to store numbers.

External links

The Museum of HP Calculators' article on the HP-27
HP-27 pictures on MyCalcDB (database about 70's and 80's pocket calculators)

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 The '''HP-27''' was a hand-held scientific and financial, but not programmable, calculator made by [[Hewlett-Packard]] between 1976 and 1978.
-Unlike all previous HP's pocket calculators, the HP-27 could do mathematic, statistic and business operations. It used [[Reverse Polish Notation]] (RPN) for calculations, working on a four-level [[stack]] (x,y,z,t).  Nearly all keys had two alternate functions, accessed by a yellow and black prefix key. So despite the 30 keys only keyboard it could access about 68 functions. The HP-27 also had a 10-digit red [[LED]] display and 10 registers to store numbers.
+Unlike all previous HP's pocket calculators, the HP-27 could do mathematic, statistic and business operations. It used [[Reverse Polish Notation]] (RPN) for calculations, working on a four-level [[stack]]{{dn|date=November 2012}} (x,y,z,t).  Nearly all keys had two alternate functions, accessed by a yellow and black prefix key. So despite the 30 keys only keyboard it could access about 68 functions. The HP-27 also had a 10-digit red [[LED]] display and 10 registers to store numbers.
 ==External links==