Milton Bradley Lightfight

Chip labeled 
/B119
COP421L-HLA/N

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L-421L(D)
HLA

20 buttons: Player 1 Left 1-5, Right 1-5; Player 2 Left 1-5, Right 1-5
1 speaker

LEDs:
25 LEDs - 5 rows by 5 columns

COP421 pinout

1  GND    6v negative
2  CKO    N/C
3  CKI    56pf cap to ground, 82K resistor to +6V
4  /Reset cap to ground, diode and resistor to +6V
5  L7     N/C
6  L6     N/C
7  L5     N/C
8  L4     LED row 5
9  Vcc    6v positive
10 L3     LED row 4
11 L2     LED row 3
12 L1     LED row 2
13 L0     LED row 1
14 SI     grounded
15 SO     LED col 5 / buttons 1, 6, 11, 16
16 SK     speaker
17 G0     buttons 16-20 common
18 G1     buttons 11-15 common
19 G2     buttons 6-10 common
20 G3     buttons 1-5 common
21 D3     LED col 1 / buttons 5, 10, 15, 20
22 D2     LED col 2 / buttons 4, 9, 14, 19
23 D1     LED col 3 / buttons 3, 8, 13, 18
24 D0     LED col 4 / buttons 2, 7, 12, 17


LED matrix
5 rows by 5 columns

        D3  D2  D1  D0  SO
L4      .   .   .   .   .
L3      .   .   .   .   .
L2      .   .   .   .   .
L1      .   .   .   .   .
L0      .   .   .   .   .


button matrix
4 rows by 5 columns

     S0  D0  D1  D2  D3
G3   1   2   3   4   5
G2   6   7   8   9   10
G1   11  12  13  14  15
G0   16  17  18  19  20


With power switch on right, switches are numbered

 1  2  3  4  5    6  7  8  9 10


11 12 13 14 15   16 17 18 19 20


Power on:
single LED in center, then small square, then large square
beeps of different frequencies
30 beeps in 23.3 seconds