4 it allows file names to contain up to 255

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Unformatted text preview: AM in it, but when later models came out with up to 16 megabytes, the inability to run programs larger than 640 Kbytes became a major limitation. 4. It was designed for the 16-bit CPUs that Intel was making in the early and middle 1980s. It could not take advantage of the 32-bit CPUs that were later made by Intel. 5. It restricted the user to eight-character file names with three-character extensions. Due to the lack of flexibility of using long file names, users often found it inconvenient to choose appropriate file names. No major operating system places this restriction on its users. 6. It had a command-line interface that some people found difficult to use and hard to learn. i Command Name Task Description In MS-DOS In Unix copy cp Copy a file del or erase rm Delete/Erase/Remove a file rename or ren mv Rename a file or move it from its old name to new name dir Is Display a directory listing mkdir or md mkdir Create/Make a new directory chdir or cd cd Change the current working directory rmdir rmdir Remove an empty directory date date Display or change the current date type cat Display (type/catenate) contents of a file Figure 14.28. Illustrating some of the shell commands. Microsoft Windows Microsoft Windows operating system was developed by Microsoft to overcome the limitations of its own MS-DOS operating system. The first successful version of this operating system was Windows 3.0, which was released in 1990. The subsequently released versions were Windows 95, Windows 98, and Windows 2000. The numbers associated with these released versions indicate their year of release. The main features of Microsoft Windows are as follows: 1. Its native interface is a GUI. Hence it is easier for a new user to learn and use the system. 2. Microsoft Windows was designed to be not just an operating system but also a complete operating environment. That is, Microsoft Windows programs conform to a standard way of working. For example, a Microsoft Windows word processor works similarly the way a Microsoft Windows spreadsheet (or any other type of Windows program) works....
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