Re: ???41cx = 42s???? Message #30 Posted by Ex-PPC member on 18 Feb 2003, 9:58 a.m., in response to message #29 by Guillermo Castarés
Guillermo wrote:
"During my years of studying Electrical Engineering I dreamed with the HP-71B. But I never could see one except the superb brochure I own until
today."
Actually, they were incredibly inexpensive a few years ago,
when a large British government organization cleared some
25,000 of them. They were so overabundant and inexpensive that you could
get one with an HP-IL ROM for just $30 or so, even some
unused ones were available. People attending one of
the Annual Meetings organized by HPCC at the time were
given one for free !
Now that all those 25,000 are already sold out, it's not
so easy, but if you are into Electrical Engineering, I
would confidently advise you to get one, there's no better
machine for that purpose in the whole world, it has all
the features needed for Electrical Engineers, namely:
- up to 512 Kb addressable space, i.e: up to 448 Kb of
internal RAM
- with a Math ROM: full set of matrix operations, working
for both real and complex one- and two-dimensional
arrays and matrices
(INTEGER, SHORT, REAL, COMPLEX, COMPLEX SHORT)
- with a Math ROM: full set of complex variables and
functions (arithmetic, trigs, logs, exponentials, etc),
all useable in calc-mode, from the command line, and
in programs, including using them as parameters or results from
user-defined functions and subprograms
- with a Math ROM: Solve and Integrate keywords, which
can accept user-defined multi-line functions, and
can call themselves recursively, so allowing solving
systems of non-linear equations, multidimensional
integration, and integration/solving of implicit
functions.
- Fourier transforms and inverses, using the extremely
speedy Fast Fourier Transform (FFT) algorithm.
- subprogram capability, passing parameters by reference
and value, and recursively. Same for multi-line, user-
defined functions. Whole matrices can be passed as
parameters, if needed.
- Full I/O, using the HP-IL ROM, which can control up to
3 different HP-IL loops at a time, with many devices
on each, including printers, tape drives, disk drives,
HP-41Cs, other HP-71Bs, etc, at speeds up to 5,000 bytes
per second.
- file system in RAM, allowing multiple programs and
binary/ASCII data files, as well as binary suprograms
and LEX (Language EXtension files) which add new
keywords to the resident BASIC, or even new languages
altogether, such as Forth/Assembler
- Incredibly powerful ROMs available, such as the Math
ROM, the Forth/Assembler ROM, or the Circuit Analysis
ROM, as well as the HP-41C Translator/Forth ROM.
... and many other advanced features, all in an
extremely portable, solid, rough, quality handset. Get one,
you won't regret it !
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