Here is a preliminary mouse unit I wrote(attachment 1). The
comments should be self explanitory, but if you need any help, or have
any problems using it email me and I will give you more detailted
documentation.
        Also I have a question. How do I change the graphics cursor. I
know from Mr Kenedy's informative post that its function 9 from int 33,
but how do I actually define it's shape. Which registers do I use, or do
I uses registers? Please help? Thanx!

[ WIZMOUSE.PAS 5K ]
unit wizmouse;

interface

   type
      mcortype = record
         left,right,center : boolean;
         x,y : integer;
      end;

   procedure initmouse(var stat : boolean; var buttons : integer);
   procedure gettxt(var mouse : mcortype; mode : integer);
   procedure getgr(var mouse : mcortype);
   function mousex  : integer;
   function mousey  : integer;
   function mousebut  : integer;
   procedure showcursor;
   procedure hidecursor;

implementation

{----------------------------------------------------------------------------}
   function mousex  : integer;
   {Post - calls the mouse driver and returns the x coordinate of the
    cursor in pixels}
       var
          tmpint : integer;
       begin
          asm
             mov ax,3;
             int $33;
             mov tmpint,cx;
          end;
          mousex := tmpint;
       end;
{----------------------------------------------------------------------------}
   function mousey  : integer;
   {Post - calls the mouse driver and returns the y coordinate of the
    cursor in pixels}
      var
         tmpint : integer;
      begin
         asm
            mov ax,3;
            int $33;
            mov tmpint,dx;
         end;
         mousey := tmpint;
      end;
{----------------------------------------------------------------------------}

   function mousebut  : integer;
   {Post - calls the mouse driver and returns the button code(1 - left 2
       - right 4 - middle) of the button(s) currently pressed}
      var
         tmpint : integer;
      begin
         asm
            mov ax,3;
            int $33;
            mov tmpint,bx;
         end;
         mousebut := tmpint;
      end;
{----------------------------------------------------------------------------}
   procedure gettxt (var mouse : mcortype;mode : integer);
   {Pre - mode in (40,80). This works for both text modes
    (co40,co80)
    Post - In mouse the x,y coordinates in text pixles and the status of
    the left, right, and middle buttons}

      var
         butcde : integer;
      begin
         mouse.left := false;
         mouse.right := false;
         mouse.left := false;
         mouse.x := mousex div (640 div mode);
         mouse.y := mousey div 8;
         butcde:=mousebut;
         with mouse do
            case mousebut of
                 1,3,5,7 : left := true;
                 2,6,3, 7: right := true;
                 4..7: center := true;
            end;

      end;
{----------------------------------------------------------------------------}
   procedure getgr ( var mouse : mcortype);
   {Post - in mouse returns the xy coordinte in graphic pixels and
    the status of the left, right, and middle buttons}
      var
         butcde : integer;
      begin
         with mouse do
            begin
               x := mousex;
               y := mousey;
               butcde := mousebut;
               case butcde of
                  1,3,5,7 : left := true;
                  2,3,6,7 : right := true;
                  4..7 : center := true;
               end;
            end;
      end;

{----------------------------------------------------------------------------}
   procedure showcursor;
   {Post - the graphical cursor is showed on the screen}
      begin
         asm
            mov ax,1
            int $33
         end;
      end;
{----------------------------------------------------------------------------}
   procedure hidecursor;
   {Post - the graphical cursor display is turned off}
      begin
         asm
            mov ax,2
            int $33
         end;
      end;
{----------------------------------------------------------------------------}
   procedure initmouse (var stat : boolean; var buttons: integer);
   {Post - if the mouse is correctly initilized stat will be true,
    otherwise stat is false, buttons contains the number of buttons the
    has currently avaliable}
      var
         statwrd,tmpbut : integer;
      begin
         asm
            mov ax,0
            int $33
            mov statwrd,ax
            mov tmpbut,bx
         end;
         case statwrd of
            0 : stat :=true;
            -1: stat :=false;
         end;
         buttons := tmpbut;
      end;

{============================================================================}
end.