DM-15CC? THIS is a calculator for real men!

Hi Guys,

You are talking recently a lot about credit card-sized calculators.

Are you kidding? This is America, the land of the Ford F-150 Pickup Trucks. Are you driving the Smart car or the new Scion iQ?

This is now a calculator for REAL men:

Have fun, happy calculator hunting and have a great weekend,



That mystery button in the bottom right means this is a calculator for wimps :-)

- Pauli


And the one above the [ON/OFF] key that it shouts back ;-))



yup, real RPN calcs have no = :-)


Yes, real RPN calcs are nonpareil :-)

From :

NONPAREIL: having no equal


How about a clear scan of your credit card??? Should help us get many units of the machine in the picture.




Joerg is bragging about having a gold card. ;-)



Doesn't meet my "carry in my shirt pocket" requirement. ;-)


My "real" gold card:

Have a great Sunday.



yup, real RPN calcs have no = :-)

Nor have they any open or close parenthesis keys !

Also UP and DOWN keys may have been label Roll Up and Roll Dwn respectively !


What does the musical notes button do?

- Pauli





Simulates "tactile" feedback from the key.




I've been meaning to ask you for the longest time.....

What's so special to you about 2*SQRT(2) that you show this on so many of the calculators in your pictures? Not that there's anything wrong with this irrational number, but it would not be at the top of my list of exciting numbers I have known :)




Good question...

I was inspired and mentored by Viktor T. Toth when I started the layout of the Datamath Calculator Museum and he used for all his calculator pictures pi = 3.14159265... in the display.

Long before (this was in 1999) I used already SQR (8) * 100000 - 282842 = ???
to reveal the number of digits used in internal algorithm of scientific calculators.

Now you know my little secret ;-))

Good that you didn't asked why my eBay handle was "jogibogi" till a few years ago. That's something I would whisper in your ear;-))



Oops - can you translate the 282842 thing to RPN, please????



Not related to your request, just an attempt to show SQRT(8) might be an interesting number :-)

8  SQRT  EEX  8  *  17  1/x  yx                (RPN)

( SQRT 8 * EE 8 ) ^ 17 x-1 ENTER (AOS)




Only 6 significant digits, not a good enough reason for me to like this number :)


Ok, sqrt(2) is better, and given infinite time it would help compute pi to the last digit :-)

I don't know GolfScript but I guess the 29-byte script for 1000 digits of pi uses the Vieta's formula, like your 12-step program for the HP-12C: (Message #22)

Edited: 19 Feb 2012, 9:58 p.m.


Long before (this was in 1999) I used already SQR (8) * 100000 - 282842 = ???
to reveal the number of digits used in internal algorithm of scientific calculators.

This fails for the 34S. The sixteenth digit is a zero.

- Pauli


Only 6 significant digits,

A more interesting result, perhaps:

pi^34 = 8.00010471505*10^16

The underlined digits match exactly the first five significant digits of pi/3. This leads to the polynomial

x^34 - (1/3)*10^12*x - 8*10^16 = 0

whose positive real root is


Nice coincidence, isn't it?

Edited to correct a mistake in the second coefficient

On the HP 50g

[ 1 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
'-1/3*1E12' -8E16]


returns a positive real root 3.14159265364. The wp 34s polynomial solver should return 3.141592653644187, but I haven't tested on it yet.

Edited: 20 Feb 2012, 2:07 p.m.



Golfscript has been mentioned here a few times, thanks for the reminder to looking into this some....

It looks to me like a mix of RPL and APL with a little LISP thrown in, only just for integers. I like all these characteristics in a programming language but not the "write only" usability of it. I wonder if there are more than 10 people in the world who've used this more than once.

Do people here have experience with GolfScript? I see that Oliver mentioned building this into his ND1, but I'm not sure if that ever happened.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Four-Level RPN and the Real World Matt Agajanian 14 6,074 12-13-2013, 03:57 PM
Last Post: Manolo Sobrino
  "HexZombie - a tool for real programmers" Thomas Chrapkiewicz 8 2,834 11-16-2013, 12:46 AM
Last Post: Kiyoshi Akima
  Unexpected problem with the real Prime Javier Goizueta 4 1,918 10-08-2013, 01:00 PM
Last Post: Marcus von Cube, Germany
  WP-34S QT emulator bug: real menus for catalogs Marcel Samek 8 2,890 07-09-2013, 11:25 PM
Last Post: pascal_meheut
  [wp34s] Minor Issue with Stopwatch on real hardware RalfGeiger 3 2,078 04-16-2013, 04:12 PM
Last Post: Eric Smith
  DM-1x Silver vs. DM-1xCC Aluminum quality? bhtooefr 11 3,287 04-14-2013, 07:08 PM
Last Post: bhtooefr
  First real picture of the new ClassPad 400 Mic 1 1,187 02-11-2013, 12:42 PM
Last Post: bluesun08
  A real physics problem that pays Egan Ford 0 962 01-19-2013, 03:35 PM
Last Post: Egan Ford
  Flashing the DM-15CC Geoff Quickfall 11 3,397 01-14-2013, 05:18 AM
Last Post: Mike (Stgt)
  Review of the DM-16CC hpnut 1 1,123 01-04-2013, 04:21 PM
Last Post: Guido (Canada)

Forum Jump: