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


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 !


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. ;-)



My "real" gold card:

Have a great Sunday.



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.



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.



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.


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


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

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