INT 2F U - DOS 4+ ANSI.SYS internal - GET/SET DISPLAY INFORMATION
        AX = 1A01h
        CL = function
            7Fh for GET
            5Fh for SET
        DS:DX -> parm block as for INT 21,AX=440Ch,CX=037Fh/035Fh respectively
Return: CF set on error
            AX = error code (many non-standard)
        CF clear if successful
            AX destroyed
Note:   presumably this is the DOS IOCTL interface to ANSI.SYS
SeeAlso: INT 21/AX=440Ch