1 TOSHIBA TC4047BP - Low-power astable/monostable multivibrator with oscillator output
3 resistors (two on component side, one on solder side)
1 Electrolytic capacitor (22 pF)- 1uF 1 Ceramic capacitor - 22pF
The PCB has one 9-pin joystick connector for mouse, and a lead with another 9-pin connector for CPC's joystick port.