Bally/Stern Arduino Sound Adapter Cable
The Bally/Stern Arduino Sound Cable is a great add-on for the BALLY/STERN ARDUINO KIT. This cable allows the use of the original speaker without any modifications. No need for external speakers. Easy to use and quick to install. Just connect one end to the top of resistor R23 and the other end in the WAV trigger.
I have only tested this for games using SB-300 sound board (Galaxy and Meteor). Will hopefully test others as time permits.