True, but the Switch was a big rethink so retaining backwards compatibility would have been tricky.

The 3DS had backward compatibility with physical DS games. The Wii U had backward compatibility with Wii games (the Wii could also play GameCube games). No surprises here - especially if they are going to call it “Switch 2” I’d have been surprised if it wasn’t compatible.

3DS cartridges had an extra notch on them to stop them being inserted into a DS. Probably we’ll get something similar here or there will be some software mechanism to stop attempts to run the new games on the old system.

Yeah, same. I set it up as it looked like the best way to control my inverter - I wanted to set it to charge from the grid when electricity was free, and discharge during saving sessions without having to do it manually. I then expanded to trying to calculate how much charge I needed overnight in cheap rate based on the solar forecast for the next day…

Anyway, I now have everything on it and keep thinking of things to add.

For me it was the second screen of Airwolf on the ZX Spectrum.

Pi Hut have a makers advent calendar. It’s a Pico microcontroller and 24 projects. Maybe that’s more a leading up to Christmas thing? Not sure how much programming there is, it might be more electronics. https://thepihut.com/products/maker-advent-calendar-includes-raspberry-pi-pico-h