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Filenames

It is important to understand DOS file naming conventions and their use. Here, filenames and some special filename "tools" called wild cards and literals are described. What is a File name?   Every program and data file is given a name to differentiate it from other programs and data files. A program is one or more computer instructions collected into a file. A data file is normally a collection of characters (or data) that make up a document, like a letter, or a database, like a collection of accounting transactions or customer records. Descriptive filenames are normally used. For example, if you create and save a letter to Mom, you might give it the filename MOM.LTR. A letter to Dad could be called DAD.LTR. A word processing program file might have the filename WP.COM. Examine these filenames a little closer. First, notice that each filename is meaningful. This is important if you want to know what is in a file by looking at its name. Obscure filenames are of little u
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Disk Construction

The various parts of standard 5.25- and 3.5-inch disks are contained in Figure 1-2. A description of each part is also provided. Write protect notch--When covered, prevents information from being recorded on the disk; when uncovered, information can be recorded. Temporary label--An adhesive-backed label allowing the contents of a disk to be identified. Permanent label--When used, contains disk manufacturer and capacity information. Exposed recording surface--Metal oxide surface used to magnetically record data. Do not touch! Protective jacket --House magnetic disk; provides protective cover. Disk sleeve (envelope)--Used to store disks;prevents  accidental contact with exposed surface. Protective slide --Protects magnetic media surface; slides open when inserted into a diskette drive (only on 3 1/2-inch diskettes). Figure 1-2 The Parts of a Floppy Disk Construction : Almost everyone is familiar with audio recording tape. The tape is a long, flexible acetate or mylar strip coated with fe
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MEM

MEM The MEM command was introduced in DOS version 4.01 and memory information. The MEM command is entered alone or with a modified slightly in MS-DOS 5.00. MEM is used to display system memory information. The MEM command is entered alone or with a parameter. MEM-Displays to all system memory values, including expanded and extended memory values. MEM PROGRAM--Displays programs presently loaded in memory with used and unused memory. You may use /P if you are using DOS 5.00 MEM/DEBUG--Dispiays a list of programs, device drivers, install drivers, and used unused memory. You may use / if you are using DOS 5.00. MEM CLASSIFY (or MEM /C)-Displays programs and cor-responding memory usage. The largest available memory block is also displayed. You may use /C if you are using DOS 5.00. Typing MEM and pressing Enter displays information similar to the following (typical of DOS 5.00): C:\>MEM                   655350 bytes total conventional memory        
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