This looks great fun. I first worked in C and 8080 so I didn't see the PDP-11 ISA until a few years later. What amazed me at the time was how much the PDP11 was like C. There is just about a one to mapping of things like pre and post increment, pointers and basic structures. For 8080 there is not much more code generated to do the same but it is not such a clean match.