Design Your Own Calculator (HP 42s++)

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Design Your Own Calculator (HP 42s++)

Postby Prairie » Sun Oct 20, 2013 1:39 am

This is a review I have posted on the iPhone App Store:

In one of several default/static modes, the latest release of ND1 (1.5) is arguably the best RPN calculator app available on any mobile platform. (Trust me, I know. I have owned HP/RPN calculators since my HP-45 decorated my belt in High School. Don't tell my kid's friends. . .) Out of the box, the ND1 provides a significant subset of the functionality of the HP 48/50 class calculators. But rather than being just another emulator, fixated on replicating the "classics" and repeating the past, the ND1 pushes forward. It is as much of a calculator development platform as a calculator. It is extremely configurable. Not only can one reconfigure the keyboard and it's keys, but one can affix one own's code to any key. Moreover, this can be done in native RPL+, in JavaScript or in combination. As a result, the ND1 is able to work with a wide variety of classes, including the traditional numeric classes, but also BigInts, Rationals, Complex, Colors and Images. (Classes, as well as other customizations, can easily be created by the user and shared with the broader ND1 community.)

Here-to-fore, my favorite RPN iPhone app has been the HP 42s (which I rate 4 *'s). Though it's an amazing replica of the original, the project is focused on recreating the 42s, as opposed to pushing forward. Though superbly engineered, it was done at a time when dynamic reconfigurability of the keyboard/functionality was limited. In contrast, the ND1 is easily reconfigured. Currently, I am taking a Chemistry course, so I wanted a 42s type calculator that has physical constants built-in. I was easily able to reconfigure the ND1 to do so. Moreover, for my day job, I wanted to include a core-set of financial functions, which I was also able to easily add.

As impressed as I am with ND1 in its current incarnation, I believe the best is yet to come. I believe that the developers of ND1 will continue to focus on configurability and expandability.

Lest you feel intimidated by all of the power of the ND1, don't be. As I mentioned, it is ready to go right out of the box, but it's nice to know if one wants to make "tweaks" that these can be easily accomplished.

Here is a screenshot of how my 42s++ looks:
ND1.PNG (109.22 KiB) Viewed 43063 times
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Re: Design Your Own Calculator (HP 42s++)

Postby oliver » Sun Oct 20, 2013 8:53 pm

Very nice, Prairie!

Thank you for the review. This helps the project and is much appreciated.

I just opened a new forum, showing some examples for the upcoming applets / calculation tools feature.

Your post pretty much belongs there now, as a first shared user calc creation. Let me know if you agree that I move it there.
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Re: Design Your Own Calculator (HP 42s++)

Postby Prairie » Mon Oct 21, 2013 9:37 pm

By all means, place it where it makes most sense.
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