I use a computer, and, as you mentioned later, one with a keyboard connected. However, except for simple stuff I still reach for my phone which has an HP emulator running, to do calculations with what looks like an actual calculator. Except that it doesn't have those very special old HP calculator buttons, so it's much worse than the real thing (I have an HP 16C laying around, but not a general style HP). But still preferable to the computer. So, here I am, with a computer and having used computers daily for close to half a century, and still grabbing for a dedicated thing for doing certain types of calculations.