Parker Brothers Split Second Chip labeled TMS1400NLL MP7314-N2 W 8027 Philippines die labeled MP7314 6 buttons: UDLR, game select and game start 53 LEDs speaker Power on beeps and displays 1 Pressing select cycles 1-8 with beeps Pressing start plays ascending tones then starts selected game TMS1400 pinout (pin names are guesses) 1 R0 LED column 8 2 R1 LED column 7 3 R2 LED column 6 4 R3 LED column 5 5 R4 LED column 4 6 R5 LED column 3 7 R6 LED column 2 8 R7 LED column 1 9 R8 resistor to transistor to speaker 10 R9 keypad row 1 11 R10 keypad row 2 12 Vdd 9v battery negative 13 Init diode and cap 14 K1 keypad column 1 15 K2 keypad column 2 16 K4 keypad column 3 17 N/C (K8) 18 N/C (O output 7) 19 O6 LED row 1 20 O5 LED row 2 21 O4 LED row 3 22 O3 LED row 4 23 O2 LED row 5 24 O1 LED row 6 25 O0 LED row 7 26 OSC pin 27 and 100pF cap to batt+ and 24K resistor to batt- 27 OSC pin 26 and cap and resistor 28 Vss 9v battery positive keypad matrix K1 K2 K4 R9 Right Up Left R10 Down Select Start LEDs - - - |.|.|.| - - - |.|.|.| - - - |.|.|.| - - - |.|.|.| - - - |.|.|.| - - - LED numbering 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 LED matrix R7 R6 R5 R4 R3 R2 R1 R0 O6 51 45 44 34 24 14 4 1 O5 41 35 31 25 21 15 11 5 O4 52 47 46 36 26 16 6 2 O3 42 37 32 27 22 17 12 7 O2 53 49 48 38 28 18 8 3 O1 43 39 33 29 23 19 13 9 O0 - - 50 40 30 20 10 -