Tandy Basketball

Chip labeled 
PIC 1655A-051
GI 7937
TAIWAN

5 buttons: Shoot, Fwd, Back, Left, Right
1 switch: 1 Player / 2 Player
Piezo buzzer

LEDs:
21 LEDs
2-digit 7-segment LED

PIC1655A pinout

1  /RTCC   - B0 + RVR to VCC
2  VDD     - Batt +
3  VXX     - VDD
4  VSS     - Batt - via switch
5  TEST    - VSS
6  RA0     - N/C
7  RA1     - N/C
8  RA2     - 2 Players
9  RA3     - button common
10 RB0     - Fwd button + LED matrix row 1 (bottom) + /RTCC
11 RB1     - Back button + LED matrix row 2
12 RB2     - Left button + LED matrix row 3
13 RB3     - Right button + LED matrix row 4 (top)
14 RB4     - Shoot button + 7-segment digit 1 (right)
15 RB5     - 7-segment digit 2 (left)
16 RB6     - N/C
17 RB7     - N/C
18 RC0     - segment A + LED matrix column 1 (left)
19 RC1     - segment B + LED matrix column 2
20 RC2     - segment C + LED matrix column 3
21 RC3     - segment D + LED matrix column 4
22 RC4     - segment E + LED matrix column 5 (right)
23 RC5     - segment F
24 RC6     - segment G
25 RC7     - piezo
26 CLK OUT - /RTCC - measured at 217kHz
27 OSC     - 18K resistor to VDD, 47pf cap to VSS
28 /MCLR   - diode and resistor


7-segment LEDs
8 8
                  C0  C1  C2  C3  C4  C5  C6 
B4  right digit   A   B   C   D   E   F   G
B5  left digit    A   B   C   D   E   F   G


LED matrix
B0        o       - this one is B0+C5
    
B3  o  o  o  o  o

B2  o  o  o  o  o

B1  o  o  o  o  o

B0  o  o  o  o  o

    C0 C1 C2 C3 C4