Toytronic Football

Chip labeled 
PIC 1655A-033
GI 7944
TAIWAN

7 buttons: SCore, STatus, Left, Right, Forward, Back, Kick
1 switch: Slow/Fast
Piezo buzzer
4511 7-segment decoder

27 LEDs
7 digit 7-segment LED

PIC1655A pinout
1  /RTCC   - B0 + down button + 4k7 to VCC
2  VDD     - Batt +
3  VXX     - VDD
4  VSS     - Batt - via switch
5  TEST    - N/C
6  RA0     - STatus button (other side VSS)
7  RA1     - SCore button (other side VSS)
8  RA2     - Fast switch (other side VSS)
9  RA3     - common for buttons back, forward, left, right, kick
10 RB0     - back button + digit 1/LED column 1 (rightmost) + /RTCC
11 RB1     - forward button + digit 2/LED column 2
12 RB2     - LED column 3
13 RB3     - left button + digit 3/LED column 4
14 RB4     - digit 4/LED column 5
15 RB5     - digit 5/LED column 6
16 RB6     - digit 6/LED column 7
17 RB7     - right button + digit 7/LED column 8
18 RC0     - 7-segment decoder A + LED top row
19 RC1     - 7-segment decoder B + LED middle row
20 RC2     - 7-segment decoder C + LED bottom row
21 RC3     - 7-segment decoder D
22 RC4     - segment DP
23 RC5     - 7-segment decoder /blanking input + LED matrix enable (0=LED matrix, 1=7-segment LEDs)
24 RC6     - piezo circuit
25 RC7     - kick button + LED column 9 (leftmost)
26 CLK OUT - N/C
27 OSC     - 27K resistor to VDD, 68pf cap to VSS
28 /MCLR   - cap and resistor


7-segment LEDs
B7 B6   B5 B4 B3   B1 B0
 7  6    5  4  3    2  1


LED matrix
   C7 B7 B6 B5 B4 B3 B2 B1 B0
C0  o  o  o  o  o  o  o  o  o
C1  o  o  o  o  o  o  o  o  o
C2  o  o  o  o  o  o  o  o  o


Piezo circuit
C6 tied high with 3.3K resistor, to 0.04 uF disc cap
disc cap to diode cathode and transistor base
diode anode to ground
transistor emitter to ground
transistor collector to transformer, other side of coil to Vdd
one side of other coil to ground, other side to piezo
other piezo lead to ground