RPN83P: RPN calculator for TI-83+ TI-84+ inspired by HP-42S

[Dave Britten]

(03-14-2024 01:02 AM)bxparks Wrote:  

(03-13-2024 08:26 PM)Dave Britten Wrote:  Somehow I missed the discussion of this when it came up a few months ago. Definitely going to load this up on my 83+ Silver and 84+ Pocket.

The 84+ Pocket SE has come up a couple of times previously. I don't think anyone has explicitly confirmed that RPN83P works on it. If you can verify that, that would be useful.

Seems like it's working fine on my Pocket. It is, after all, just an 84+ SE in a smaller form factor.

(03-14-2024 01:02 AM)bxparks Wrote:  

(03-13-2024 08:26 PM)Dave Britten Wrote:  Adding RPN, base conversions, and a few unit conversions could actually push the 83/84 into daily-driver territory for me. It looks like there's a decent selection of unit-conversion functions, but my one request would be to make it as complete and flexible as the 19BII, TI-85, etc.

I'm not familiar with the 19BII or the TI-85. Can you expand? The most flexible solution, of course, is to support keystroke programming with custom menu bindings and custom key bindings. I did a quick estimate of how long it would take to implement keystroke programming: I got something like 1000-2000 hours. I might decide to just do it, for the technical challenge, but it will take a while, 1-2 years.

Certainly! On these calculators, you select a category of units (length, area, temperature, etc.), and are given a menu with various units to choose from. To convert, you first press the unit you are converting from, and then press the unit you are converting to. So if I wanted to convert 25 ft to m on the 19BII, I would type 25, press "FT", and then press "M", which would convert the value in the X register. The TI-85 is similar in that you get a menu of units, and press two in sequence to enter a complete conversion function. So to enter the expression 25[ft]>[m], you would type 25, press "FT", then press "M". You can include as many conversions as needed in a single expression.