re: SOP for Nintendo
"Sega Game Gear"
I think the equivalent Sega console at the time was the Master System, an ugly semi-pyramid thing in red and black. It resembled the Tyrell building from Blade Runner, I'm sure there's a special geometrical word to describe that shape. Rhombus, or something. It had a mixture of cut-down Sega arcade titles and the Alex Kidd character. You could put sausages into the cartridge slot, although it did nothing and just made the console greasy.
There was also a lot of noise about the PC Engine, which was a big cult amongst people who regularly imported games (which was trickier and more hardcore back in the late 1980s than it is today). It had lovely graphics but was very expensive. I think it was launched internationally as the TurboGrafix something or other, but it was too expensive and it didn't have Mario.
The Game Gear was a portable equivalent of the Master System, and went up against the Atari Lynx and the Nintendo Game Boy. I remember it being more popular than the Lynx (at least in the UK), but vastly vastly less popular than the Game Boy. That's another case where the Nintendo option was technically inferior (the Game Gear and Lynx were colour, and the Lynx was, I believe, 16-bit, at a time when "16-bit" was a kind of magic phrase), but practically better, and with a better software library. And a really good version of R-Type that was playable on that tiny screen.