Coleco Head to Head Basketball Chip labeled /027B COP420L-NMY/N back L-420L(C) NMY/B 6 buttons: Pass CW, Pass CCW, Display, Shoot, Defense Left, Defense Right 2 switches: Skill 1/2, # Players 1/2 Piezo buzzer LEDs: 41 LEDs 2-digit 7-segment LED COP420L pinout 1 GND 9v Batt negative 2 CKO N/C 3 CKI 101 cap to ground, 43K resistor to +9V 4 /Reset N/C 5 L7 N/C 6 L6 7-segment LED segment G 7 L5 7-segment LED segment F 8 L4 7-segment LED segment E, LED matrix 9 IN1 buttons and switches 10 IN2 buttons and switches 11 Vcc 9v battery positive via switch 12 L3 7-segment LED segment D, LED matrix 13 L2 7-segment LED segment C, LED matrix 14 L1 7-segment LED segment B, LED matrix 15 L0 7-segment LED segment A, LED matrix 16 SI N/C 17 SO piezo 18 SK N/C 19 IN0 buttons and switches 20 IN3 grounded 21 G0 LED matrix and buttons and switches 22 G1 LED matrix and buttons and switches 23 G2 LED matrix and buttons and switches 24 G3 LED matrix and buttons and switches 25 D3 LED matrix multiplexer - A 26 D2 LED matrix multiplexer - B 27 D1 LED matrix 28 D0 LED matrix Inputs 19 9 10 20 IN0 IN1 IN2 IN3 21 G0 Pass CW Pass CCW Skill 2 -- 22 G1 Shoot Display -- -- 23 G2 Defense R Defense L 2 Players -- 24 G3 unused 1 unused 2 test pins -- LED matrix L0 L1 L2 L3 L4 L5 L6 D0A LEDs -- 8 11 -- 17 -- -- D1A LEDs 1 9 12 -- 18 -- -- D2A -- -- -- -- -- -- -- D3A -- -- -- -- -- -- -- G0A LEDs 24 25 -- 27 28 -- -- G1A LEDs 29 31 33 -- 35 -- -- G2A LEDs 41 40 39 38 37 -- -- G3A LEDs -- 7 10 -- 16 -- -- D0B LEDs 36 34 -- 32 30 -- -- D1B LEDs 19 20 21 -- 23 -- -- D2B -- -- -- -- -- -- -- D3B -- -- -- -- -- -- -- G0B digit 1 (r) A B C D E F G G1B digit 2 (l) A B C D E F G G2B LEDs 13 22 14 26 15 -- -- G3B LEDs 2 3 4 5 6 -- -- LED layout 01 0203 0506 04 07 08 09 10 11 12 13 14 15 16 17 18 19 20 28 29 21 22 26 27 30 23 24 25 31 32 33 34 35 36 37383940 41 Piezo Connections COP SO to 10K resistor to NPN transistor (ST1702) base and to piezo wire 1 transistor emitter to ground transistor collector to piezo wire 2 and tied high via 2.2K