The random access memory (RAM), read-only memory (ROM), and interface hardware chips in your Commodore 128 are like postal stations with hundreds of thousands of mailboxes, each of which can hold a single character, or byte of information. This book is a map of all of those memory locations, but it's more than just a list of addresses. It's also a thorough discussion of how the locations are used by the computer, and, more importantly, how you can take advantage of this information to write more powerful programs.