Boot up the C64U, and you’re greeted by a re-creation of the C64’s menu. Here, you can type in operation commands just as you would back in the day, using the BASIC programming language. Problem: I don’t have the first clue about BASIC. However, in what is possibly the greatest throwback of all, the C64U comes with a spiral-bound, 273-page user guide. It is an absolute tome. Somewhat surprisingly, it’s not a reprint of anything that came with the original, but rather a…