Arcade Collecting > Miscellaneous Arcade Talk

What is the purpose of a Slam switch?

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rchadd:
i see there is connection for a slam switch on the centipede wiring harness.

Does anyone know what the original purpose of this was?

SirPeale:
You abuse the machine (ie SLAM the machine) you lose any credits you put in already.  The machine resets.

Stingray:
Kind of like a "tilt" in pinball.

-S

2600:
Yep same thing, some cabs call it tilt.  Mame accurately maps these too, which if you haven't remapped and press it in the middle of a game is not fun.

Ken Layton:
The slam switch is a holdover from the electro-mechanical pinball machine days. It's purpose was to prevent players from obtaining free credits by beating/kicking/hitting the front door from the vibration of the coin switch contacts.

The switch has also been known as "anti-cheat", "anti-slam", "tilt", and "slap" switch. In the old days it was a normally closed switch and was wired in series with the coin switches. When banging on the door, it opened the circuit thus momentarily killing the coin switch circuit. Modern games that use a tilt/slam switch (like gambling/slot machines) are normally open switches and go to the game board. When the switch is activated the gameboard resets (just like you turned off the power then back on again) and ALL CREDITS are lost. Sometimes an audio alarm sounds! :o

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