HP and Swiss Micros RPN Calculators
===================================

I've been a user of RPN caclulators for a few years now.
I can't claim to have grown up with HP and RPN - I came to it
quite late, but once I'd discovered RPN I couldn't go back to
"normal Casio algebraic" calculators.

If you use RPN already you'll understand. If you don't you should!

My "collection" of RPN Calculators
==================================

HP
==

HP35s (I have two)
HP11C (an old one from eBay)

I had a "Prime" but didn't like it, so I gave it away.

Swiss Micros
============

DM15L
DM16L
DM41L
DM42
DM41X
DM32


All have their different strengths and weaknesses.

The DM42 is perhaps the best all-round calculator for most
purposes. It's a clone of the HP42s which is widely regarded as the
best general purpose caclulator HP made. 

The DM15L is a clone of the groundbreaking HP15C. I usually run it
with a 3rd party firmware, described elsewhere. Running this
firmware makes the DM15L behave like a mini DM42 - with excellent
complex number support. And it's VERY fast. Much much faster than
the stock DM15L running original (or modified) HP15C ROM code.

The DM16L is a clone of the HP16C - the "programmer's calculator"
and is made for operations on Decimal/Hex/Binary/Octal numbers,
with functions suited to the low-level bit-twiddling used in
programming (esp. for Assembler etc).

The DM41X is a clone of the HP41CX, and it has the ability to run 
custom ROM modules etc. It's a fantastically versatile machine, but
unless you grew up with the HP41 it's a bit of a handful to use for
everyday stuff, with the need to "spell out" many functions that
aren't immediately available on the keyboard. It's possible to do
lots of customisation though, and is great fun to play with.

The DM32 is a clone of the HP32Sii and is a great general purpose
RPN caclulator. It has both "keystroke" programming AND equations,
and is very usable. It lacks full-blown complex number support (it
has /some/ complex number features, but rather limited) otherwise 
it's a very handy device. 

They all have a place.