It is nearly impossible today to escape the immediate reach of computers and computer-based systems. There is probably a cell phone in your pocket or on your desk and, perhaps, an iPod as well. For many of you, your laptop or desktop computer is sitting nearby as you read this paragraph. And that’s not all. Your car probably has several embedded computers controlling various functions. Even your microwave oven and the machine that launders your clothes depend on computers to function properly. As you are probably aware, most of these machines can talk to each other, using the Internet or some other ERP SME Singapore networking technology
You’ll notice that this computer features a ‘‘Core 2 Duo Processor’’ CPU, 2 GB of DDR2 SDRAM memory, a 16× DVD ±RW Drive, and a 160 GB SATA hard drive. It also contains a 256 MB PCI Express graphics card among other things. But how good a system is this? Are these features important to the user? Is this the right combination of features that you need in your computer to have the computer perform the work that you wish to get done? Are there features missing that we need? Is a Core 2 Duo processor the best CPU for us? Perhaps we are paying too much for the performance that we need. Or maybe we need more. And what does ‘‘Core 2 Duo’’ mean, anyway? What I/O ports might you need to assure a satisfy long-term investment of computers for your organization? Is a 16× DVD ±RW drive adequate for your work? What if you have to burn a lot of disks? What other information about this system would allow you to make a more informed decision? (For example: Hey—where’s the networking capability?
ERP SME Singapore we can design and implement Web pages without understanding how the Web browser gets its pages from a Web server or how the Web server creates those pages; we can purchase a computer system from a salesperson without understanding the specifications of the system. And yet, there is something missing. Perhaps the package doesn’t do exactly what we want, and we don’t understand the machine well enough to risk fooling around with the package’s options. Perhaps if we understood the system better we might have written and configured the program to be faster and more efficient. Perhaps we could create Web pages that load faster and work better. Perhaps the salesperson did not sell us the optimum system for our job. Or perhaps it’s nothing more than a sense of excitement that’s missing. But that’s important, too! You are reading this book because you are a student studying to become a computer professional, or maybe you are simply a user wanting a deeper understanding of what the computer is all about. In either case, you will most likely be interacting with computer systems for the rest of your life. It’s nice (as well as useful) to know something about the tools of the trade. More important, understanding the computer system’s operations has an immediate benefit: it will allow you to use the machine more effectively
As a ERP SME Singapore user, you will be aware of the capabilities, strengths, and limitations of the computer system. You will have a better understanding of the commands that you use. You will understand what is taking place during the operation of the programs that you use. You will be able to make informed decisions about your computer equipment and application programs. You will understand more clearly what an operating system is, and how to use it effectively and to your advantage. You will know when it is preferable to do a job manually, and when the computer should be used. You will understand the most efficient way to ‘‘go online,’’ and what benefits might be gained from a home network. You will improve your ability to communicate with system analysts, programmers, and other computer specialists. As a programmer, it will allow you to write better programs. You will be able to use the characteristics of the machine to make your programs operate more effectively. For example, choosing the appropriate data type for a variable can result in significantly faster performance. Soon you will know why this is so, and how to make the ERP SME Singapore appropriate choices. Computers can perform integer calculations incorrectly if the integers exceed a certain size, but they do not necessarily warn the user of the error. You will learn how this can occur, and what can be done to assure that your programs generate correct results. You will discover that some computers will process nested loops much more quickly if the index variables are reversed. A rather surprising idea, perhaps, and you’ll understand why this is true. You will understand why programs written in a compiled language like C++ usually run much faster than those written in interpreted program languages like BASIC or scripting languages like JavaScript. As a systems architect or system analyst, you will be responsible for the design and implementation of systems that meet an organization’s information technology (IT) needs, recognizing that the differences in the cost and capabilities of the components that you select may have significant impact on the organization. With the knowledge gained here you will be in a better position to determine and justify the set of computer system components and the system architecture that are appropriate for a particular job and to determine the trade-offs with other possible system architectures
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