Computer organization basics: A(n) ________ is not a functional unit of a computer.

Introduction / Context:Functional units of a basic computer are the standardized architectural blocks that enable input, processing, storage, and control. This question checks recognition of what is and is not a core functional unit.

Given Data / Assumptions:

• Standard textbook model: input, output, memory, ALU, and control.
• We must choose the item that is not one of these core units.

Concept / Approach:The classic Von Neumann view includes input unit, output unit, memory unit, ALU, and control unit. A modem is an external communication device/peripheral, not a core functional unit.

Step-by-Step Solution:

Verification / Alternative check:Intro CS and architecture texts categorize modem as an I/O device on communication interfaces, not an internal architectural unit like the ALU or control unit.

Why Other Options Are Wrong:

Common Pitfalls:Equating frequently used peripherals (like modems) with functional units. Functional units are architectural blocks, not external devices.

Final Answer:modem