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Sunday 27 May 2018 at 15:09
More documentation is up now: http://docs.missionpinball.org/en/dev/hardware/lisy/index.html. Let us know if you find any mistakes or miss anything in the documentation.
Source: http://pinside.com/pinball/forum/topic/gottlieb-system-1-and-system-80-support-in-the-mission-pinball-framewo/page/2#post-4420884