CPU composition basics In computer organization, the control unit and the arithmetic/logic unit are often grouped together and referred to collectively as the ________.

Introduction / Context:
Foundational computer architecture bundles the control unit (sequencing and control of operations) with the arithmetic/logic unit (ALU) that performs integer arithmetic and Boolean operations. Together, they are historically known as the central processing unit (CPU). This item checks basic terminology used across textbooks and datasheets.

Given Data / Assumptions:

• Control unit orchestrates instruction fetch, decode, and control signals.
• ALU executes arithmetic and logical functions on data.
• Memory and I/O are separate subsystems interfacing with the CPU.

Concept / Approach:
The CPU is the heart of the computer, combining the control logic that interprets instructions with the ALU that manipulates data. Modern microarchitectures integrate additional blocks (register files, floating-point units, caches), but the classical definition remains: CPU = control unit + ALU (plus registers).

Step-by-Step Solution:

Verification / Alternative check:
Block diagrams in architecture texts consistently show CPU comprising control + ALU, typically with registers and internal buses. Microprocessor datasheets refer to these as internal CPU components.

Why Other Options Are Wrong:

• Inputs and outputs: These are peripheral interfaces, not the CPU.
• Microcomputer: Includes CPU, memory, and I/O on a board/system; broader than the asked grouping.
• Arithmetic/logic unit: Only one of the two parts; control unit is missing.
• Processing core only: Informal term; still essentially the CPU but the correct, standard name is CPU.

Common Pitfalls:
Equating microprocessor (a chip) with microcomputer (a complete system), or forgetting that the CPU also requires registers and control paths to operate the ALU effectively.

Final Answer:
central processing unit