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Chapter 4

BUS 237 Fall 2012 - Chapter 4 Study Questions

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Department
Business Administration
Course
BUS 237
Professor
Zorana Svedic
Semester
Fall

Description
Chapter 4 Study Questions 1. Why do you need to know about information technology? Knowing a small bit about information technology, including hardware and software, makes us more knowledgeable consumers of technology. 2. Where did all this information technology stuff come from? The first digital computing devices were available in the 1950s. The first personal computers came on the market in the early 1980s, and the Internet came into wide use during the 1990s. The first patent on a digital computer was filed in 1947. Early computers were complex and expensive. A single person interacted with the computer, and only one program could run at a time. Over time, these machines were slowly improved and commercialized. The first commercial digital computers were large, room-sized devices called mainframes – were used in business and government & cost between $200,000- 400,000. Second generation mainframes were introduced in the 1950s – they were smaller, easier to maintain, and more reliable. Third generation were introduced in the 1960s, and these included operating systems and multi-processing. These cost millions of dollars. Multi-processing allowed for time-sharing, so many users could interact with the computer at one time. Time-sharing eventually led to more sophisticated networks. The first microcomputer was developed in 1975. Often had no display screen or monitor and required users to develop their own programs. By 1981, the microcomputer had developed enough for computers to launch the personal computer (PC). These were easier to use than mainframes and were immediately popular. The value of information technology can be measured not only in the power of the processor, but also in the power of the network that can be accessed through the machine. 3. What does a manager need to know about computer hardware? Hardware consists of electronic components that input, process, output, and store data according to instructions encoded in the software. Typical input hardware devices include the keyboard, mouse, document scanners, and barcode scanners. Microphones are also input devices. Processing devices include the central processing unit (CPU) – which selects instructions, processes them, performs arithmetic and logical comparisons, and stores results of operations in memory. CPUs vary in function, speed, and cost. The CPU works in conjunction with the computer’s main memory – CPU reads data and instructions from the memory. Computers also can have special function cards that can be added to the computer to augment its basic capabilities. Output hardware consists of video displays, printers, audio speakers, overhead projectors, and other special-purpose devices. Storage hardware saves data and programs. (CDs, DVDs, magnetic disks, USB, etc.) Computers represent data using binary digits, called bits. A bit is either a one or a zero. A switch can either be closed or open—a computer can be designed so that an open switch represents zero, and a closed switch represents one. Bits are grouped into 8-bit chunks called bytes. Majority of data requires one byte for one character. Bytes are used to measure sizes of non-character data as well. A kilobyte (KB) is a collection of 1024 bytes. A megabyte (MB) is 1024KB. A gigabyte (GB) is 1024MB. A terabyte (TB) is 1024GB. The CPU (central processing unit) plays a central role in computer use. To process data, the CPU must first transfer the data to main memory. To execute an instruction, it moves the instruction from main memory into the CPU via the data channel or bus. CPU has a small amount of very fast memory called a cache—keeps frequently used instructions in the cache. The computer’s main memory contains instructions for the operating system (OS), which controls the computer’s resources as well as a block of data. CPU conducts memory swapping to ensure that each program has enough memory space to run. (Memory swapping does make the computer move a bit slower). Cache & main memory are often called volatile—their contents are lost when the power is off. Magnetic disks and optical disks are non-volatile—their contents survive when power is off (unsaved documents are still lost). CPU speed is expressed in hertz. CPU speeds continually increase over the years. An employee who does simple tasks will be fine with a CPU of 2 GHz. An employee who processes large tasks will need a CPU of 3 GHz or more. 4. What is the difference between a client and a server, and what is cloud computing? Client computers are employed for word processing, spreadsheets, database access, etc. Most client computers also have software that enables them to connect to a network. Servers provide services—run blogs, publish websites, sell goods, host databases, support printing, etc. Need to be faster, larger, and more powerful than client computers. A server farm is a large collection of computers that coordinate all activities (used for Google or Amazon). In cloud computing hardware, software, and applications are provided as a service, usually through a web browser. This makes software and data services available from any location at any time. Huge reduction in the cost per megabyte of storage and network bandwidth has pushed the notion of cloud computing. A user can access data, load applications, and store data using other people’s servers. Cloud computing builds upon the concept of grid computing, in which several computers are used to address a single problem at the same time. Grid computing uses software to divide and apportion pieces of a program among several computers. 5. What does a manager need to know about software? Figure 4-9 on Pg. 95 Computer software can be categorized into 1 of 2 varieties  1. Operating Systems (large and complicated programs that control the computer’s resources), Example: Windows 2. Application Software (perform specific user tasks), Example: Microsoft Word. Two important software constraints: - Each version of an operating system is written for a particular type of hardware. o In most cases you cannot use an operating system that was
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