Pc engine-how does the multitap work/connect pads up.Priority Encoders?

[bigsanta]

Just wondered about the pc engine's multi tap.How does this thing work,as with only one pad connected to the console and the multi plexer IC and the polling that's done  to find what the user has pushed ,that's all explained on this site,along with the 6 button pad.But when ,say with four pads in use with the multi tap ,how does the console/software title make sense of this much user action ,Priority Encoders ? and how are the pads connected inside the multi tap ,diasy chain like ?