Extending Gameboy emulators to sewing machine hardware addons!
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Upscaling textures on SNES emulators to improve graphics on today's displays: https://arstechnica.com/gaming/2019/04/hd-emulation-mod-makes-mode-7-snes-games-look-like-new/
Really neat approach. I've seen emulators do clever 2D smoothing, but this feels closer to 'original intent'.
I don't read enough code. I skimmed a few GB emulators today and saw some great approaches to structure. The nicest:

