Computer, book, William Stallings, author, desk, office, wooden shelf, multiple books stacked, lamp, soft lighting, warm atmosphere, leather chair, glasses, beard, middle-aged man, sitting, reading, researching, notes scattered, coffee cup nearby, computer screen displaying code, circuit boards, wires, processors, motherboards, keyboards, mouse, CPU architecture diagram, von Neumann model, Harvard architecture, pipelining, microarchitecture, cache memory, RAM, ALU, registers, instruction set, bus width, clock speed, multiprocessor system, symmetric multiprocessing, asymmetric multiprocessing, distributed systems, network topology, routers, switches, protocols, packets, routing algorithms, computer network diagram.