From: nowhere@never.at   
      
   I posted and copied from the wrong (serial mouse) page:   
      
   and haven't seen the required synch detection in your code.   
      
   a standard three button PS2 mouse send three byte packets:   
   (four byte if wheel-mouse was setup)   
      
    1.byte: b7     Y overflow   
           b6     X overflow   
           b5     Y sign bit (9 bits in total)   
           b4     X sign bit (-"-)   
           b3 =1  indicate first byte (even no guarantee)   
           b2     Mid button down   
           b1     Right button down   
           b0     Left button down   
   2.byte: b7..0  X-movement   
   3.byte: b7..0  Y-Movement   
   4.byte  b7..0  Z-wheel signed byte (only if configured)   
   __   
   wolfgang   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)