問2
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組込みソフトウェアに該当するものはどれか。
平成26年度 秋期 ITパスポート試験 問2
This question's explanation and your answers so far.
解説
問 2
Incorrectア
The operating system pre-installed on a PC is basic system software that lets a general-purpose computer run a wide variety of applications; it is not specialized for controlling one particular device. The fact that it is already installed at shipment is not a criterion for deciding whether software is embedded. A PC operating system is general-purpose software that can be replaced or reinstalled, so it is not embedded software.
Incorrectイ
Game software that you downloaded yourself onto a smartphone is application software that the user can add or delete afterwards. It does not take charge of controlling the device, and it is not built into the device as one unit, so it is not embedded software. Software such as the communication control software that controls the smartphone itself would count as embedded software.
- ウ
正解 ウ is correct. Embedded software is software that is built into a specific device such as a home appliance, a car, or industrial equipment, and that runs in order to control that device and realize its intended functions. The software that automatically focuses a digital camera (autofocus control) is built inside the camera itself, and it controls the lens drive and the sensor input so that the shooting function itself is possible. It is not something the user installs separately or swaps out; it ships as one unit together with the device, which is also typical of embedded software. Such built-in software is often supplied written into ROM or similar memory, and it is also called firmware.
Incorrectエ
The map update data of a car navigation system recorded on an auxiliary storage medium is not software (a program) but data. The program that controls the car navigation unit is embedded software, but the map data that this program refers to is not. On top of that, it does not even satisfy the condition of the question, which asks for something that qualifies as software.
ここがポイント
- Definition of embedded software: software built into a specific device that runs in order to control that device and realize its functions. Home appliances, digital cameras, cars, and industrial equipment are typical examples, and software written into ROM or similar memory is also called firmware.
- Two axes for telling them apart: (1) Is it an OS or an application for a general-purpose computer, or a control program dedicated to a specific device? (2) Is it a program at all, or merely data? Screening the choices with these two points makes the right and wrong answers clear.
用語