Sinclair Scientific Calculator photographed c 1974 - From Wikimedia Commons https://commons.wikimedia.org/wiki/File:Sinclair_Scientific.jpg

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   Minoru Saba (minorusaba@toad.social)'s status on Thursday, 01-Aug-2024 08:47:37 JST Minoru Saba

   "During the 1970s and 1980s, Hewlett-Packard used RPN in all of their desktop and hand-held calculators"
   https://en.wikipedia.org/wiki/Reverse_Polish_notation
   🔸Couldn't afford HP calculators as an undergrad, but had access to one bolted to a lab bench.
   Took a while getting used to RPN.
   Eventually bought a Sinclair Scientific in kit form; it had a red LED display, was painfully slow, but worked.
   https://en.wikipedia.org/wiki/Sinclair_Scientific
   #ReversePolishNotation