Comprehensive Introduction to Computer Information Systems and Hardware Basics
Understanding Information Systems
An information system is a complete interconnected environment designed to turn raw data into useful information. Raw data is defined as quantifiable facts and figures. The system consists of five essential parts: people, hardware, software, procedures, and data. These elements work together to transform information into a usable format for accomplishing specific human goals.
Five Components of Information Systems
People are the primary reason computers exist, as they use technology to accomplish goals. Planning an information system begins with analyzing the requirements of the people involved. This includes identifying if they need specific information, need a computer to activate a device for a task, or are seeking education or entertainment.
Hardware refers to the physical parts of a computer system. This category includes circuit boards with silicon chips and transistors, input devices such as the keyboard and mouse, and output devices like monitors and printers.
Software consists of programs that tell the hardware what to do. Hardware remains idle without software. Software exists at various levels, including operating systems such as Windows or Mac OS and application programs like word processing or accounting software.
Procedures are the manual steps or interactions people must follow to tell the computer which software to run. Using accounting software effectively requires procedures such as starting the software, opening the specific file storing business data, and issuing commands to open the checking account register. These procedures can be learned through online Help systems, printed user manuals, training classes, or trial and error.
Data is the information that computer programs operate upon. In the context of accounting software, data includes the date, amount, and recipient of checks. The program stores this entered data for later recall.
Information Systems Management
An Information Systems (IS) manager oversees the big picture of a corporation's computer systems. Their role involves bringing all components together to achieve results. An IS manager may lead an initiative to provide daily reports to production managers. This process involves assembling a programming team, identifying hardware and software needs, developing data-handling procedures, and ensuring data is delivered in an easy-to-use format.
Types of Personal Computers
A personal computer (PC) is designed for use by one person at a time. PCs are categorized by size:
A Desktop PC is designed for use at a desk and is seldom moved. It includes a large metal box called a system unit containing essential components, connected to a separate monitor, keyboard, and mouse.
A Notebook PC, also known as a laptop, is a portable computer that folds up like a notebook. A netbook is a smaller version, short for "Internet book," designed primarily for web access rather than intensive application use.
A Tablet PC is a portable device featuring a touch-sensitive display screen on a plastic frame. These do not have built-in physical keyboards; instead, a software-based keyboard appears on the screen, and the user's finger acts as the pointing device.
A Smartphone is a mobile phone capable of running computer applications and accessing the Internet. They feature touch-sensitive screens and provide voice calls, text messaging, and location-aware applications such as Global Positioning Systems (GPS), mapping programs, and local business guides.
Multi-User Computer Systems
Multi-user computers serve groups of people ranging from small offices to international enterprises:
Servers are dedicated to supporting a network and its users. They provide centrally accessible storage for data and allow sharing of devices like scanners and printers. Small servers may look like desktop PCs but run systems like Windows Server or Linux. Large servers managing wide-ranging networks may resemble mainframes.
Mainframes are large, powerful computers capable of processing and storing massive amounts of business data. For instance, a mainframe can collect sales data from hundreds of cash registers in a department store for executive review. Modern mainframes consist of one or more refrigerator-sized cabinets.
Supercomputers are the largest and most powerful computers, often occupying entire floors or large rooms. They are utilized in high-tech research facilities, academia, and government for specialized tasks like cryptanalysis (code breaking), molecular modeling, weather forecasting, and climate mapping.
Core Software Types: BIOS and Operating Systems
The Basic Input Output System (BIOS) is the most fundamental software, stored on a read-only chip on the motherboard to prevent accidental changes or corruption. It assists with system startup and executes basic hardware testing.
The Operating System (OS) manages all computer activities after startup. Its primary purposes include:
Providing the user interface for human communication and feedback.
Running applications and enabling human interaction with them.
Controlling and managing the file storage system.
Communicating with hardware, such as telling a printer to print or a monitor what image to display.
Examples of Operating Systems
Common operating systems include:
Windows: Versions include Windows XP, Windows 7, Windows 8, and Windows 10.
Apple Mac OS X: Recent versions include MacOS (Mojave, 2018), MacOS (High Sierra, 2017), and MacOS (Sierra, 2016).
Linux: Popular distributions include Ubuntu, Fedora, and Linux Mint.
Determining System Specifications and Versions
To identify the Windows version on Windows 7:
Click File Explorer at the bottom of the screen.
Right-click "Computer" and select "Properties."
Review the "Windows Edition" heading for the version, edition, and service pack details.
On Windows 10, the process is similar:
Click File Explorer at the bottom of the screen.
Right-click "This-PC" and select "Properties."
Review the "Windows Edition" heading.
Sample system properties might include a processor like the Intel(R) Core(TM) i5 CPU M 540 at or an Intel(R) Core(TM) i3-3220 CPU at , with installed memory (RAM) reaching . Systems are typically categorized by system type, such as a Operating System.
Additional Software: Utilities and Applications
Utility software assists with system maintenance and security. These programs may be included with the OS or added later to check storage disks for errors, block security threats, or back up files.
Application software is designed for productivity or entertainment. Productivity software, such as MS Office, helps with tasks like managing money, charting data, writing documents, and emailing.
The Information Processing Cycle
All components of a computer system fit into the four categories of the information processing cycle:
Input: Devices like keyboards, mice, and touch screens that allow humans to put data into the computer.
Processing: Components that move and process data inside the computer, such as the motherboard, processor chips, and memory chips.
Output: Components like monitors, printers, and speakers that provide processing results to humans.
Storage: Components like hard drives, USB flash drives, and DVDs that hold software and data until needed.
Network Fundamentals and Ethernet
A network is a group of computers sharing data and resources, such as Internet services or printers. The common standard is Ethernet, which can be wired or wireless. Most PCs have a network adapter with a port for an Ethernet cable. Wireless Ethernet is specifically known as Wi-Fi or by the standard . Portable devices like tablets often lack wired networking capabilities.
In home or small business networks, an Ethernet cable connects a computer to a router, which manages traffic between devices. A router also shares a broadband (always-on) Internet connection among all connected computers.
Short-Range Wireless Connectivity
Bluetooth serves as a short-range wireless alternative to Wi-Fi. It is primarily used for connecting devices directly to a computer, such as a wireless headset for a phone or a speaker for an MP3 player. Due to its limited range of approximately , it cannot replace Wi-Fi but offers an economical connection solution for limited spaces.
The Global Network: The Internet
The Internet is the largest network in the world. Access is facilitated through an Internet Service Provider (ISP), such as a local phone or cable company. The ISP provides a MODEM, which is a device that translates computer requests into data compatible with the Internet.
Questions & Discussion
What are the five parts of an information system? The five parts are people, hardware, software, procedures, and data.
What is the difference between hardware and software? Hardware represents the physical components of the system, while software consists of the programs and instructions that tell the hardware what to do.
What is the difference between software and data? Software is the program code that performs operations, whereas data is the factual information (facts and figures) that the software operates upon and stores.
What is a brief definition of "personal computer"? A personal computer is a computer designed to be used by only one person at a time.
What key characteristics of a desktop PC distinguish it from a notebook PC? A desktop PC is designed for a desk and is rarely moved, consisting of a separate system unit, monitor, keyboard, and mouse. A notebook PC is portable and designed to fold up for carrying.
What are the four key functions of an operating system? The four functions are providing a user interface, running applications, managing file storage, and communicating with hardware.
What is productivity software? Name the widely used productivity suite available from Microsoft. Productivity software is designed to help users perform practical tasks like writing documents or managing data. The most widely used suite from Microsoft is Microsoft Office.
What are the five parts of an information system?
What is the primary purpose of the operating system?
Describe the difference between hardware and software.
What characterizes a personal computer (PC)?
What is productivity software? Give one example.