In sorting through some parts I came across a box of stuff I ordered from 'Pinball Life' over 15 years ago, and in there is a 'tube' of 18 pin chips as photographed below. They're probably very useful, but being a bit of a total novice when it comes to doing circuit board repairs I'm totally lost as to what they're for, and I can't remember why I ordered them!
Does anyone know what this chip is useful for? Maybe it's good for repairing the acid damage zone in Bally boards for example...?
Used in the switch matrix in WPC Pinball.
https://pinside.com/pinball/forum/topic/how-to-test-uln2803-switch-matrix-chip
Quoted from pinballslave:Thanks a lot! I'm guessing this us in the acid damage zone of those boards, which explains why I'd buy a batch of them...
Yes , for sure and the occasional slip of adjusting a switch and touching a lamp socket while the power is on. 
I've done it myself...
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Litvinov
Lodi, CA