On Tue, 18 Feb 2014, Brian Reay wrote:

On 18/02/14 20:21, Brian Howie wrote:
In message , Brian Reay writes

For the 'everyday' user, RPN was not popular and calculators offering,
almost, algebraic, entry became more popular. I think the first
calculator to offer true algebraic entry (ie following BODMAS/BIDMAS
convention) was Texas. Even today some cheap calculators don't follow
the convention. One of the many things I warn pupils of when I teach
calculator use.


I used a National Semiconductor 4640 RPN calculator for about 30 years.
So much so that I can't use a "normal" calculator. I've still got it but
it needs the charger socket and the batteries replaced.

RPN can't be beat for long chain calculations.


True.

Either way, RPN as the user interface has become a 'niche' market. Do HP
still offer RPN?

Yes, but they are still higher priced, so you'd be going out of your way
to buy one. I seem to recall seeing one in a flyer that could be switched
between RPN and "normal", which I suppose has advantages. But, if you have
both, I suspect the pull is towards "normal".

I have a minor collection of early scientific pocket calculators. Some
TI, including the one that could be hooked to a printer (and the printer).
And some HP, but the batteries don't keep a charge.

I should get one of the HP going, not only are they RPN, but they have LED
readouts, astonish people with the ancient technology. Just as soon as I
figure out how to get that battery clip back on my TI LED watch from 1977.

Michael