Pin   Assignment

1     Base 1
2     Base 2
3     Base 3
4     Base 4
5     Base 5
6     Base 6
7     Base 7
8     Base 8
9     Ground
10    Common cathode (for flyback diodes)
11    Collector 8
12    Collector 7
13    Collector 6
14    Collector 5
15    Collector 4
16    Collector 3
17    Collector 2
18    Collector 1