iPhone App: i41CXp RPN Calculator with Printer

Posted on this Sunday, September 21, 2008 11:30 by caw
Filed Under iPhone | 6 Comments


Let’s face it: the calculator bundled with most cell phones and smart devices is lame. It does the basics and that’s about it. That was certainly the case with the Calculator application on the iPhone and iPod touch 1.x and the one in the 2.x release isn’t much better.

I’m an engineer by trade and I’ve relied on calculators to do much of the work. My preference has always be for hp. I’ve owned several over the years: 41C, 48SX, 49g+ and 50g. Most emulations of these that I’ve found have been either limited to PC or Macs (not very portable), or they’ve been crippled in some way.

Not any more. AL Software is offering an hp 41C emulation called i41CXp. It’s a full implementation of the 41CX with a virtual printer. And it supports the four module "ports" just like the 41-series! Most of the ROM images from the modules developed by hp and others are available from hp41.org. i41CXp knows how to find them and can download them over the wireless network.

(Image from AL Software’s web site.)

So far, I’m quite impressed. The layout on the iPhone is just like the original device. The emulation is fully programmable and it supports User mode so you can assign functions (built in, from the ROMs, or your own programs) to keys. And the price is right too: just $6.99 $14.99 through the iTunes App Store.

(Ed. The post originally said $6.99. This was an error. It should have said $7.99 which is the price I paid. A recent check of iTunes shows two version of the program: i41CX (no printing) for $7.99 and i41CXp (with printing) for $14.99. My apologies for the mistake.)


6 Responses to “iPhone App: i41CXp RPN Calculator with Printer”

  1. Matt on November 4th, 2008 21:50

    You might want to use the calculator you bought and recalculate the price that your touting in the article. It’s $14.99 not $6.99. Dork!

  2. caw on November 4th, 2008 23:10

    My bad. As Matt so gently pointed out, the price in my post was wrong. According to the receipt I paid $7.99 for the i41CX+ and not the $6.99 I quoted in my post. I noticed on the iTunes Store that AL Software appears to be selling two versions: an i41CX (lacks the printing functions) for $7.99 and an i41CX+ (with print functions enabled) for $14.99. Mine receipt says got the iHP41CXp and paid for the lower-priced product.

  3. Jason on December 13th, 2008 13:46

    Verry cool. My beloved calculator now on my iPhone! Anyone know if someone is working on the old plug in packs like the math pack or advantage pack?

  4. caw on December 13th, 2008 14:16

    If you tap the display of the i41CXp, it “flips” and show four ports at the top. If you tap one of the port covers, you should see a module picker. If you select “Download from URL…” and press the Select button. You can supply a URL for it to fetch the binaries from. The default, http://www.hp41.org, has got most of the modules that were produced. Click download and you can select from the list of modules: 41Z, ADV-APP, ADVANTAGE, etc.

  5. Jason on December 13th, 2008 23:35

    I don’t have the “p” version. When I “flip” it over I don’t see the four ports. Is this only avalable on the “p” (printer) version?

  6. caw on December 14th, 2008 10:11

    Yes, it would appear so. When I got mine, there was only the one version in the iTunes App Store and it was offered at the lower price. I guess that was a fluke. You might contact the developer and see if they offer an upgrade?

Leave a Reply