DOS App Full Screen

This is because by default, the full screen settings for dos mode under windows 2000 is not 80x25 characters as in conventional DOS mode.

In order to fix this, create a shortcut to your DOS program. Then right click on this shortcut to open the properties dialog box. Under the "Layout" tab bar, change height for screen buffer size and window size to 25. Width for both should be a 80 which is the default, if it isn't change it to 80.

Also, make sure to set it to run at full screen by default in the option tab bar.

This should work for you old DOS apps.

you didn't tell which OS you were using.
Because I am using NT I will explain fo this, but it probably works the same for Windows 9x.

In the winnt folder there is a file named _default. It is the default shortcut for starting a DOS Box. Try and adapt the settings of this box (start it and right-click on the top bar for properties)to see if this solves your problem.

Another possibility is to start the DOS app using a shortcut that first opes a dosbox.

in the shortcut enter c:\winnt\cmd or c:\windows\command.com

Good luck...