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flashing buttons when credit has been inserted?

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ahofle:

To further expound on what Andy said, the LED blinking stuff was moved out of the MAME core and into a helper application called ledutil.exe (which comes with MAME).  To get this working with an IPAC, you will need to have that running in the background to listen for the 'blinking' events from MAME.  LEDUTIL then blinks the appropriate keyboard LEDs.  If you are planning on using an IPAC and super bright LEDs under the P1 and P2 buttons, you will also need a driver board that connects to the IPAC to provide the proper power to the LEDs:
http://www.gamecab.com/products.asp?cat=26

This is the setup I have running and it works great. 

arzoo:

LEDBlinky uses headkaze's mame output library which I believe uses the same code (with some additional bug fixes) as ledutil.

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