Over Christmas, I spent a lot of time with my beloved (and quirky) HP-16C. I decided I wanted to take it everywhere, but doing a phone calculator app seemed daunting. I've been plugging away at it for 3 months now as one of my many side projects.

I'm ready to call it a usable version 1.0. I'm sure there are bugs, but I'll work those out as I use it more.

The only upgrades I did over the original are to add a second line so you can see the Y register, and it can display all 32 bits of binary without scrolling (wider "LCD")

I wrote more than 200 tests, because the last thing a calculator app needs is to get the math wrong.

Submitted it to the app store (free). Now we wait for approval.

@mrdoornbos Very cool. I have the SwissMicros replica but I can’t stand the texture on the back. I use it constantly when I’m doing assembly and am continuously reminded how much I would prefer a real one.
@tpolecat I happen to have both. The original has gotten expensive to find these days.