At one time application and system software were

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Unformatted text preview: the software at this layer is designed to hide the hardware details of the system from application programmers and to coordinate the operations of the various hardware devices for optimizing the performance of all the devices. Surrounding the system software is the application software layer that consists of a wide range of software that are designed to do; specific task or solve a specific problem. The final layer is the layer of users who normally interact with the system via the user interface provided by the application software. Different application software usually provides different user interfaces. Hence how a particular user interacts with the computer system depends on whicl application he/she is using. . - HARDWARE (Physical devices/components of the computer system) SYSTEM SOFTWARE (Software that constitute the operating and programming environment of the computer system) APPLICATION SOFTWARE (Software that do a specific task or solve a specific problem) USERS (Normally interact with the system via the user interface provided by the application software) Figure 10.1. Relationship among the hardware, system software, application software, and users of a computer system. ACQUIRING SOFTWARE Computer software has evolved from an item of minor economic concern with first generation digital computer to one of major concern in today's computing systems. In the early days of computers, more than 80% of the tots computer cost was devoted to hardware, but today more than 80% of the cost is for software. At one time application and system software were included in the purchase price of the computer. Today, however, software is usually not included in the purchase price of the computer. For most computer manufacturers the purchase price of a computer includes only the hardware along with a minimum of system software. The customs normally has to pay extra charges for additional system software and application software that he/she may wish 1 purchase. A desired software may be obtained today in one or more of the ways discussed below. The relative advantage and limitations of each way of obtaining software are also discussed...
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