Possible you could have 4 or 5 pin optos on that board:
"
Yes, TZ -did- use 4 pin opto's. But .. he says "There are 5 pins..." in his
message below....
Could be that somebody swapped out his board with a later version? Or am I
misinterpreting his message?

If using a 4 pin opto -- get the .0086 suffix part as these are directly
driving the switch matrix.
The reason they used a 5 pin opto in later boards was to get around using
the custom opto as used originally in TZ.

4 pin: http://www.marcospecialties.com/pinball-parts/5490-13451-00
5 pin: http://www.marcospecialties.com/pinball-parts/5490-14575-00

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