By the final chapter, the reader has designed a (often called the “Bartee machine”)—with an instruction set, fetch-decode-execute cycle, and rudimentary I/O.
By grasping these concepts, you'll gain a deeper appreciation for the inner workings of digital computers and be better equipped to design, develop, and troubleshoot digital systems.
He wasn't in the library anymore. He was standing inside the architecture of a machine from 1960.