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    Re: Book on calculators
    From: Howard G
    Date: 2023 Sep 3, 07:10 -0700

    Hi David


    No cheap look alike HP ever entered my house or my fingers touched – those are all original versions of HP machines.

    The HP 42S was the replacement for the  old 41CV – it was the 41CV I carried with me on the P3B Orion along with the magnetic tape adapter and thermal printer to do my 3 star fixes. Unfortunately I didn’t keep all my programs but the 41C then the 41CV came out in 1979 – I went to P3B Orions in 1977 – but I started programming with the TI 59

    But it was a pain to load the magnetic cards each time you turned it on – the TI 59 didn’t retain when you turned it off. The 41CV with card reader did.

    The HP 42S came out after I had left flying 1988 but accompanied me through university whilst I studied to be a veterinarian – heavily into mathematics, statistics and physics. Not a single person on the vet course understood RPN – actually few people do.



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