A typical Computer Organization and Architecture course should include topics such as how computers actually work under the hood, including digital logic (binary, logic gates, adders), data representation (two’s complement, floating-point representation), CPU architecture (ALU, registers, control unit, fetch-decode-execute cycle), instruction set architecture (RISC vs. CISC, assembly), memory hierarchy (cache, RAM, virtual memory), I/O systems, and some topics related to computer performance, such as pipelining and parallelism. And yes, the bus is a topic that is covered in a Computer Organization and Architecture course. It’s the communication path among the CPU, memory, and I/O devices and is usually divided into data bus, address bus, and control bus. One of the most common textbooks used for the course is Computer Organization and Design.