Quoted from Aurich:Metallica's drop targets are all reset by a single coil. So you knock them down, and they all pop up together at once, however many are down.
Memory drops all have two individual coils on them. Which means they can be reset separately, not just all at once, but the second, smaller coil, can also knock them down without the ball hitting them.
Basically means the game can control the state of each drop. So a skill shot could drop the first one for instance. Or they could reset to a previous state across multiple balls from multiple players.
I'd split a hair here and say "memory drops" are any drop target bank that can be returned to a desired/previous/known state, however it gets there. So a bank that resets all the targets at once, but then can drop individual targets under software control (Nine Ball) or can knock them down all at once but then reset individual targets (Alien Poker) has memory targets (even if in those examples they aren't used specifically to put them into a remembered state.) Two coils for every target gets expensive, so a single reset and individual knock down coils is a pretty common way to do things, even if it makes for a bit of thrashing in the target action during a game.
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