It was, but if you could start building a collection, it didn't take that much to basically have documentation for Everything. All the ROM routines, timings, pin diagrams, BASIC features, etc, etc. Maybe a dozen books, maybe even half that? I don't remember. But at some point you pretty much had everything you'd ever possibly want to know. That was really the last computer I ever had that feeling with. Everything since is just layers and layers of complexity that changes faster than you'll ever get a handle on it and truly understand the whole machine inside out.