Dos 4+ ansi.sys internal - Get/set display information

        Entry:
          AX = 1A01h
          CL = 7Fh for GET
             = 5Fh for SET
          DS:DX -> parm block as for INT 21, AX=440C, CX=037F/035F 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