Quoting from the MS-DOS 6.22 Help program ("HELP DISPLAY.SYS" at a command 

"The EGA value supports both EGA and VGA display adapters.  If you omit the 
type parameter, DISPLAY.SYS checks the hardware to determine which display 
adapter is in use.  You can also specify CGA and MONO as values for type, but 
they have no effect because character set switching is not enabled for these 

It does help to read the documentation, at least when it is provided 
(documentation for "modern" programs is confusing/useless in many cases).

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