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Yeah... RPN et al... :)

• gugagore 8y ago
  Though famously (I believe) it was HP calculators that were known for reverse-Polish notation.
  • opencl 8y ago
    That's the joke, I imagine. RPN is Forth-like in that they're both stack based. Their 28/48/49/50G line shipped with RPL(Reverse Polish Lisp) which was heavily inspired by both Forth and Lisp. Very weird language but I always enjoyed programming those calculators. The ancient HP41 and HP71 did have Forth interpreter ROMs available.