On Fri, 11 Sep 2020 06:04:49 +0100, The Natural Philosopher
 declaimed the following:

>On 11/09/2020 01:51, Martin Gregorie wrote:
>> The HP-35, IIRC the first scientific/engineering pocket calculator to be
>> available, appeared in 1972. I still have a working HP-21, its successor,
>> that I bought in 1976.
>
>And I have a linux app. :-)

Bah, Humbug...

 My phone has a Android app that reproduces the HP Prime! Including the
"exam mode" feature lock-out capability.

 Have a HP-41CX with bar-code wand, mag-stripe reader/writer, and I/R
printer interface. Also HP-48SX and HP-50g (the latter had too many layout
changes for easy use -- the 48 is a natural advance from the 28 and 41).

 My first was an HP-25, and the third was the HP-28 -- I don't recall if
the latter is in storage or self-destructed; the 25 died when I couldn't
get new battery packs (it was the only one I owned that could be used at
work, as it lost its mind when powered down... Working in a black program
is a pain.)


--
 Wulfraed                 Dennis Lee Bieber         AF6VN
 wlfraed@ix.netcom.com    http://wlfraed.microdiversity.freeddns.org/

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