Coleco Electronic Quarterback

Chip labeled 
TMS1100 NLL
MP3415
BSP 7823

die labeled
MP3415

9 9-segment LEDs
5 buttons
2 switches
piezo


TMS1100 pinout
1  R8   - digit 1 (rightmost)
2  R9   - high = segments B and C, low = segments A2 and D2
3  R10  - piezo
4  VDD  - battery - 
5  K1   - button common
6  K2   - pass/kick switch common
7  K4   - skill switch common
8  K8   - TP2 pad
9  INIT - N/C
10 O7   - segment DP
11 O6   - segment G
12 O5   - segment F
13 O4   - segment E
14 O3   - segment D
15 O2   - segments C and D2
16 O1   - segments B and A2
17 O0   - segment A
18 OSC1 - 100pF disc cap to VSS, 33K resistor to VDD
19 OSC2 - OSC1
20 VSS  - battery + via switch
21 R0   - digit 9 (leftmost) and move left/right button and pass switch and skill 2 switch and TP1 pad
22 R1   - digit 8 and move down button and kick switch and skill 1 switch
23 R2   - digit 7 and move up button
24 R3   - digit 6 and K/P button
25 R4   - digit 5 and DISP button
26 R5   - digit 4
27 R6   - digit 3
28 R7   - digit 2


LED Segments

   AA          AA          AA          AA          AA          AA          AA          AA          AA       
FF    BB    FF    BB    FF    BB    FF    BB    FF    BB    FF    BB    FF    BB    FF    BB    FF    BB    
   GG          GG          GG          GG          GG          GG          GG          GG          GG       
EE    CC    EE    CC    EE    CC    EE    CC    EE    CC    EE    CC    EE    CC    EE    CC    EE    CC    
   DD          DD          DD          DD          DD          DD          DD          DD          DD       

  
   A2          A2          A2          A2          A2          A2          A2          A2          A2       
 
 
   D2          D2          D2          D2          D2          D2          D2          D2          D2       


Piezo Connection

Pin 3 of TMS1100 to one piezo wire and 75492 input
75492 output to other piezo wire and tied high with 10K ohm resistor