(HP71B) Modern GAMMA formula for Forth or ASM?

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Very interesting. Thanks.
And: using multiprocessing for math calculation (I have already done with python where separate calculation like Result = Series A / Series B where both series are independent) is something I had in my head for HP71 spreading tasks to other HP71 in a loop (just for fun; probably giving the task via HP-IL is too slow but could simulate a parallel processing).