Oh really? What's the proper output aspect ratio of the Gameboy? And the SGB? I ask because I can manually adjust the aspect ratio on my upscaler, so I'd be interested in this.
Game Boy was 160x144. Aspect ratio calculators tell me that's a 1.11:1 ratio.
However, I'm reading the screen size of the GBC was 43mmx38mm which would be a 1.13:1 aspect ratio. Which is probably an incredibly tiny difference.