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- Subject: HP calculators and decimal (BCD) floating-point precision...
- From: sur-behoffski <sur_behoffski@...>
- Date: Wed, 27 Jun 2018 21:03:19 +0930
(Replying directly to the list; sorry, as usual, for breaking any
In the distant past, I owned, and loved to use it for many years,
a HP-29C with *CONTINUOUS MEMORY!!!!* Also, it had 98 steps for
IIRC (but the Web is not backing me up here), there was a second
"Applications Book" of useful problem and elegant algorithms for
solutions... authored by William Kahan.
Anyway, to get to the point of HP calculators and the present
My recollection is that all computation internally for the
built-in algorithms was performed in ** 13-digit ** registers,
and the final result was rounded to ten digits for display.
I don't know if the internal storage registers were limited to
10 digits, or if they also supported 13-digit floating-point
values. This would have been relevant where user-defined
programs (and subroutines etc) were executed.
My recollection may be incorrect... but if not, it may explain
some of the results that people have been talking about.
sur-behoffski etc etc