Sometimes it's not an "emulator" in the typical sense. Some of these are hardware reproductions (see: Palmer Luckey's ModRetro Chromatic). Others do hardware e

Sometimes it's not an "emulator" in the typical sense. Some of these are hardware reproductions (see: Palmer Luckey's ModRetro Chromatic). Others do hardware emulation using FPGAs (see Analogue Pocket). Even a lot of the emulator-based hardware include a physical cartridge slot. They read the data off the cartridge and then run it on an emulator.