In SX Microcontrollers, SX/B Compiler and SX-Key Tool, prozach wrote:

The SX is used in an arcade setting on carpeted floors.  The kids discovered early that a good static charge could add a coin to the game.  That problem has been solved, however the kids now rub there feet on the carpet and try to shock it trying to get a credit.  I believe this is the cause of the failure, but I may be wrong.

I am using a atx computer power supply to run the game since they are cheap.  The 5v is rated at 30 amps but I only draw a 2-3 at any time.  Possible an overvoltage is the problem.  I do not know how regulated these are at low current.

The problem only happens maybe one in 1000 plays, so I am having a tough time finding the cause.  I used a car coil to really shock the game and this is when the power supply dropped to about 4v and caused the chip to burn.  I am unable to reprogram any of the chips and a few have actually burned up.

The I/O's are current protected but not isolated by an opto. 

Zach

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