Nissan made two ZCAR distributor IC modules from 1979-'83
E12-80 1 top plug (2 terminals). Used on 1979-7/80 ZX, Maximas, B210. This module works best on carbureted motors. The dwell curve is preset into the module, it only needs the distributor and coil to function.
E12-92 1 top plug, 1 side plug. Used on 8/81-83 ZX's, Maximas. I found when using a E12-92 in place of a E12-80 it automatically retarded the timing 8 degrees. Even setting the time up 8 degrees made my engine feel sluggish, so I don't recommend it on carbureted motors. According to the shop manual, the 2nd plug on the side is for a spark advance signal from the brain and other sensors. Some claim this module is identical to the E12-80. Not on my engine unfortunately.
E12-80