25 years ago I treasured my paper copy of an article about how to do general purpose I/O on a printer port, and always kept an old PC around for experiments for

25 years ago I treasured my paper copy of an article about how to do general purpose I/O on a printer port, and always kept an old PC around for experiments for that. But with Raspberry Pi computers, interfacing is so much easier. And no need to worry about blowing up a precious motherboard, because they don't cost much. And the Pi4 is as fast as oldest PCs I still have, core 2 duos.