dm319

Yes, looks like coated aluminium - not unlike a can but a little thicker and with no sharp edges. I've not seen these before but I think they are disposable/recyclable - i.e. a replacement for a plastic cup and far more pleasant to drink from. I took mine home as a souvenir, but I have had to unsquish it today taking it out of hold luggage.

Yes, in fact before I got my DM42 I had one holiday where we had no internet access in the evenings and as the children were small and slept early, I didn't have much to do but I was able to learn a lot about using and programming free42.

You do have to remind yourself at the beginning that you're using RPN, but after a while it feels a bit like working sums out on paper.

Just to clarify - means two taps of the esc key in succession will clear highlighting (ps I'm curious how other people do it!).

nmap <esc><esc> :noh<return>

Yes, I also have caps mapped to esc, but done in keyboard firmware so that holding it functions as ctrl.

In neovim I have two escapes mapped to :noh

I tried to play this on an original IBM PC. Without a mouse and only 4 colours. It went badly.

Yeah, I think they need to tune their nibs before they let them out. No such thing as too much flow - just too little paper.

I was too stupid to realise how hard they were to do right.

That's lovely - these calculators are very 'dad' style to me also (though my dad had a 70s style Casio). There's something about the voyager HP calculators with their landscape format - they are really satisfying to use, I can see why he kept it on him!

It's a Stilform fountain pen. They are a recent make using machined parts and bock nibs with a nifty magnetic cap. I'm having slight issues with the bock nibs though - they are going to need a bit more work to keep the flow how I like it.

I always thought of financial calculators as a sort of gelded single-function function machine and I didn't really get them. However, that would ignore the vast number of models available from HP, and that their second ever pocket calculator was a financial one. It turns out that solving the time value of money equation is non-trivial, and the work done on that probably paved the way for calculators with a solver.

The other thing I didn't appreciate until I had to use it, is that the interface of the 12c - with the 5 buttons in the top left for n, i, pv, pmt and fv is peak user interface. Press once to input data, but a second consecutive press of these buttons will trigger the solve and drop the result into x. It's perfect, and means you can solve and use all the calculator functions and stack continuously. Most modern methods use a table, which is hard to extract and input information from the calculator.

This might be the best looking graphing calculator I've seen.