While Windows has moved away from using Microsoft Disk Operating System as a base, versions of DOS still persist. Some programs refuse to run in modern versions of Windows and require a DOS emulator. If your business runs programs in DOS, understanding how to configure the Config.sys file to load your devices, such as a CD-ROM, is necessary. Configurations vary, so check which version of DOS your company is using.
Step 1
Press "Windows-R" to open the Run menu. Type "cmd" (without quotes here and in subsequent commands) and press "Enter" for a command prompt.
Step 2
Type "cd\" and press "Enter." Type "edit config.sys" in the command window to open an editor for the Config.sys file.
Step 3
Type in the configuration options for your Config.sys file. The most common Config.sys commands are the following: DEVICE=C:\WINDOWS\HIMEM.SYS DOS=HIGH,UMB DEVICE=C:\WINDOWS\EMM386.EXE noems
The Himem.sys file is a high memory manager, into which the next command "DOS=HIGH,UMB" loads DOS. "EMM386" is the extended-memory support and is generally disabled with the "noems" command.
Step 4
Add any devices you need to load to Config.sys with the "DEVICEHIGH" command, such as "DEVICEHIGH=C:\ATAPI\CDROM.sys" for a CD-ROM drive.
Step 5
Type "LASTDRIVE=S," where "S" is the last drive letter you want available to DOS.
Step 6
Add the following lines to your Config.sys file to add a menu to your Config.sys and boot loading: [MENU] MENUITEM STARTUP, Basic Startup MENUITEM NETWORK, Network Start
This displays a menu on startup with the items Startup and Network. Farther down in the file, type "[STARTUP]" along with any commands to run under that item, such as the basic configuration in the previous example, which enables you to specify commands for the various Config.sys configurations based on your needs. See Resources for more Config.sys options.
Step 7
Press "Alt-F" then "S" to save the file, or click on the "File" menu and choose "Save."
Step 8
Press "Alt-F" then "X" to exit, or choose "Exit" from the menu.
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