Analysis of information sources in references of the Wikipedia article "RetroN" in English language version.
Hyperkin was expected to unveil a machine dubbed the RetroN 4 at the retro games convention, but altered the machine when a fifth cartridge slot was added in the latter stages of its development.
Hyperkin's reveal of the 'RetroN 4' console at the Midwest Gaming Classic turned out to be the unveiling of the RetroN 5, with the addition of another cartridge slot for Japanese Famicom games (which have 60 pin connectors vs. the NES's 72 pin).