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INT 10h,  03h (3)        Read Cursor Position and Size

    Reports the cursor position (row and column) and size for a specified
    display page.

       On entry:      AH         03h
                      BH         Display page number

       Returns:       CH         Cursor start line
                      CL         Cursor end line
                      DH         Row
                      DL         Column

       Registers destroyed:      AX, SP, BP, SI, DI

  --------------------------------------------------------------------------
          Cursor Start and End line values (CH and CL)

                            Legal               Default
      Adapter            Start  End         Start      End
       CGA                 0     7            6         7
       MDA                 0    13           11        12
       EGA                 0    13          6(11)     7(12)  Depends on mode
  --------------------------------------------------------------------------

       Notes:         This service can report the position of the cursor
                      on the active display page or on an inactive page.
                      Since there is only one hardware cursor, the cursor
                      start line (CH) and cursor end line (CL) (and hence
                      the size of the cursor) will be the same no matter
                      what page number is specified.

                      In graphics modes, this service reports the logical
                      position of the cursor, even though the cursor
                      itself is not displayed.

                      The upper left corner of the display is DH = 0h,
                      DL = 0h, while the lower right corner is DH = 18h
                      (24), DL = 27h (39) for 40-column mode or 4Fh (79)
                      for 80-column mode.

                      See Service 05h for a list of legal page numbers for
                      the different display modes. Because the service
                      does no value checking, erratic results can occur if
                      you specify an illegal page number. The page number
                      for graphics modes is 0.

                      Use Service 02h to set the current cursor position.

                      Use Service 01h to set the current cursor size.

                      Early versions of the Monochrome Display Adapter
                      (MDA) and the Compaq display adapter had a bug. They
                      incorrectly reported the cursor start and end scan
                      lines after the video adapters were initialized (the
                      mode had changed or the machine was powered on). The
                      MDA would report the cursor size as CH = 06h, CL =
                      07h, instead of CH = 0Bh, CL = 0Ch. The Compaq
                      reported the cursor size as CH = 00h, CL = 67h, for
                      any display mode. Note that this is a problem only
                      after the mode has changed or after power-up. Once
                      the cursor size is set (using service 01h), then
                      this service will report the correct cursor size.