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Gottlieb System 1 eprom adapter
A simple plug-in adapter that will allow you to use commonly available 2716 eproms in place of the impossible to locate rockwell 4bit bipolar rom chips on Gottlieb system 1 eprom boards.   No board modifications or soldering required.  Clean and quick. Sold as the adapter only,  I cannot provide the code in this instance due to Gottlieb licensing policies. Pricing will be $12 + shipping