INT 2F - DOS 3.3+ DISPLAY.SYS internal - INSTALLATION CHECK AX = AD00h Return: AL = FFh if installed BX = ??? (0100h for MS-DOS 3.3+) Note: DOS 5+ DISPLAY.SYS chains to previous handler if AL is not one of the subfunctions listed here SeeAlso: AX=AD01h"DISPLAY",AX=AD02h"DISPLAY"
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