page_title: HP-27
hierarchical_section_title: HP-27
caption_attribution_description: A Hewlett-Packard calculator HP-27 from 1976.
context_page_description: 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 for calculations, working on a four-level stack. 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.
context_section_description: 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.
caption: A HP 27
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