FWIW, while this is a reasonably good book (though stay away from the Disk section, IIRC it completely misunderstands the way the Apple encoding works), consens

FWIW, while this is a reasonably good book (though stay away from the Disk section, IIRC it completely misunderstands the way the Apple encoding works), consensus is that "Understanding the Apple II", by Jim Sather, is the clearly best work on the subject: https://archive.org/details/understanding_the_apple_ii https://archive.org/details/understanding_the_apple_ii