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INT 15 - TopView - "GETBUF" - GET VIRTUAL SCREEN INFO
        AX = 1024h
        BX = segment of object handle for window
              (0 = use default)
Return: ES:DI -> virtual screen
        CX = size of virtual screen in bytes
        DL = 00h text screen
             01h graphics screen
SeeAlso: INT 21/AH=2Bh/CX=4445h
See Also: 10FE
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