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Getting Ready

To perform the remaining activities in this blog, your DOS program files should be in the current directory, or a search path must be established to the directory containing the DOS command files. Assuming that you are using a hard drive system and your DOS file are located in the C:\DOS directory, you can type PATH=C:\DOS and press Enter from the DOS prompt to establish the search path. This automatically searches the specified directory for program files. Operation of the PATH command will be described in detail in Section 4 of this blog.

If you are using a floppy disk system, your DOS files should be located on the disk in drive A.

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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                  ...

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...

Disk Construction

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