Which of the following is a touch screen used for? (Choose two.)

A touch screen is a hybrid peripheral that combines the functions of both an input and an output device. It serves as an output device by presenting visual information to the user, just like a standard monitor. Concurrently, it acts as an input device by detecting the location of a user's touch on its surface, allowing for direct manipulation of on-screen elements and data entry. This dual capability is fundamental to its design and purpose in modern computing devices.

A. Storage: This is the function of components like hard disk drives (HDDs) or solid-state drives (SSDs), not the screen.
D. Networking: Connectivity is managed by network interface controllers (NICs), such as Wi-Fi or Ethernet adapters.
E. Processing: The central processing unit (CPU) and graphics processing unit (GPU) are responsible for executing instructions and computations.
F. Logging: This is a software function that records system events; the screen may display logs but does not perform the logging itself.

1. Patterson

D. A.

& Hennessy

J. L. (2017). Computer Organization and Design RISC-V Edition: The Hardware Software Interface. Morgan Kaufmann. In Chapter 1

Section 1.3

"Under the Covers

" the authors describe the five classic components of a computer

including input and output. A touch screen is explicitly categorized as a device that serves both functions: "The screen is not only an output device; it is also an input device" (p. 10).

2. Buxton

W. (1990). "A Three-State Model of Graphical Input." In D. Diaper et al. (Eds.)

Human-Computer Interaction - INTERACT '90 (pp. 449-456). Elsevier Science Publishers B.V. This foundational academic paper on human-computer interaction discusses input technologies

where touch screens are implicitly treated as integrated input/output systems for direct manipulation

contrasting with indirect input devices like a mouse that are separate from the display (output).

3. University of California

Berkeley. (2019). CS 61C: Great Ideas in Computer Architecture (Machine Structures)

Lecture 1: Introduction. In introductory lectures on computer architecture

peripherals are classified by function. The touch screen is a canonical example of a device that belongs to both the input and output categories. (See slide decks for "Five Components of a Computer").