Ee FUNCTIONAL BLOCK DIAGRAM EM84502 PS/2 MOUSE CONTROLLER Mohammedan a terrazzo osc or [nd PIN DESCRIPTIONS Vio Power oP I X,Y inputs, Floating : Comparative input. a GND ; Schmidt trigger input. { = Short to OSC OUT : Testing Mode. | Scout o Clock output. CLK vo 8042 auxiliary port CLK line. DATA vo 8042 auxiliary port DATA line. Ve Ground R I Three key-switches exert seven different combinations totally.