The NES and SNES Classic systems support SD cards : r/miniSNESmods
Ultimate NES Cartridge Mod « Retro Gaming :: WonderHowTo
Alternative Solder Points for SD Storage Mod : r/miniSNESmods
By far the cheapest Micro SD method : r/miniSNESmods
Ultimate NES Cartridge Mod « Retro Gaming :: WonderHowTo
FPGA Emulates NES Cart; Prototype So Cyberpunk | Hackaday
STL-Datei NES Cartridge - SD and MicroSD card storage・Design zum Herunterladen und 3D-Drucken・Cults
EverDrive N8
Original NES Guts Upgraded With RetroPie | Hackaday
The NES and SNES Classic systems support SD cards : r/miniSNESmods
Nes Sd Card - Etsy
GitHub - going-digital/sdnes: SD converter mod-board for the Nintendo NES Classic, Famicom classic, SNES Classic and Superfamicom classic. For use with Hakchi.