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Re:Zkeme80 – A Forth-Based OS for the TI-84+ Calculator by realo on Saturday January 19, 2019 @05:51PM (#18949731)
Yeah... RPN et al... :)
Re:Zkeme80 – A Forth-Based OS for the TI-84+ Calculator by gugagore on Saturday January 19, 2019 @07:03PM (#18950073)
Though famously (I believe) it was HP calculators that were known for reverse-Polish notation.
Re:Zkeme80 – A Forth-Based OS for the TI-84+ Calculator by opencl on Saturday January 19, 2019 @07:52PM (#18950246)
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.