Int 33 Fn 0103  - Grtmouse V1.00+ - Set Active Characters                  [M]

   AX = 0103h
   CH,CL,DH,DL = ASCII codes to be remapped to display mouse pointer

Note:  the default active characters are D0h,D1h,D6h,D8h; the active
    characters should be in the range C0h to DFh

See Also: AX=0100h,AX=0104h