Back in 2016, there was an eBay auction for an extremely rare and obscure console, apparently a prototype for an unreleased U.S. version of the PC Engine Duo-R, dubbed the PC-Duo.
Below in this spoiler is an image of the PC-Duo.
Below is a link to a #CUPodcast by Pat the NES Punk discussing...
IF Some one wants to play his prototype without red screen error code, i can remove it. Anybody can send me bin cue files on private message and i can send it private message with the unlocked game :) i like to help some friends if cannot play the game :)