3. To the right side are 6 connection points. From to bottom these are labelled 0 (or 8 not easy to see), 4, 3, 2, 1, 6.
The following ICs components are inside interface: 1 ST T74LS367AB- 2/4-bit 3-state noninverting buffer/line driver 2 TOSHIBA TC4013BP x 2- Dual D flip-flop with set and reset 1 TOSHIBA TC4047BP- Low-power astable/monostable multivibrator with oscillator output 2 3 resistors at top(two on component side, one on the other solder side of the PCB.) one 1 capacitor.
The PCB has one 9-pin joystick connector for mouse, and a lead with another 9-pin connector for CPC's joystick port.