Milton Bradley Electronic Battleship 1982 (no speech, has code book) Chip labeled S+B8536 COP420-JWE/N 46 buttons: Player 1 and Player 2 1-10, A-J, CM, CLE, Fire 1 switch: Load/Go LED speaker 4 AA batteries COP420 Pinout 1 GND batt- 2 CKO N/C (measured low) 3 CKI 100pf cap to ground, 14K resistor to VCC 4 /Reset VCC 5 L7 buttons 7/G 6 L6 buttons 6/F 7 L5 buttons 5/E 8 L4 buttons 4/D 9 IN1 buttons 9/I 10 IN2 buttons 10/J 11 Vcc batt+ 12 L3 buttons 3/C 13 L2 buttons 2/B 14 L1 buttons 1/A 15 L0 buttons CM/CLE 16 SI switch LOAD/GO (other pole = gnd) 17 SO transistor to LED 18 SK N/C (measured 188.5KHz, 48.4% duty cycle) 19 IN0 buttons 8/H 20 IN3 buttons FIRE 21 G0 3.9K resistor to speaker transistor base 22 G1 2.2K resistor to speaker transistor base 23 G2 1.0K resistor to speaker transistor base 24 G3 speaker transistor base tied high 4.7K 25 D3 buttons player 2 Fire, CM, 1-10 26 D2 buttons player 2 CLE, A-J 27 D1 buttons player 1 Fire, CM, 1-10 28 D0 buttons player 1 CLE, A-J speaker connection 2N3904 transistor: emitter to 10ohm resistor to ground collector to 68ohm resistor to speaker (other speaker terminal to VCC) base pulled high with 4.7K resistor, connects directly to G3, 1K resistor to G2, 2.2K resistor to G1, 3.9K resistor to G0 button matrix D1 D0 D3 D2 ---- Player 1 ---- ---- Player 2 ---- L0 CM CLE CM CLE L1 1 A 1 A L2 2 B 2 B L3 3 C 3 C L4 4 D 4 D L5 5 E 5 E L6 6 F 6 F L7 7 G 7 G IN0 8 H 8 H IN1 9 I 9 I IN2 10 J 10 J IN3 Fire - Fire -