The expansion port for the SNES was going to serve a purpose as a place to connect an add on called the Super NES or SNES CD-ROM add on. They actually made 200 prototypes called the Nintendo PlayStation, a combination of the SNES and PS1. The relationship between Nintendo and Sony had soon soured, so Nintendo went to partner with Philips, the creator of the CD-ROM format and the CD-i, a failed video game console. This didn't last too long, so 199 of the prototypes were scrapped. There is only one Nintendo PlayStation that exists in the world, which was sold at an auction for $300,000+ in February of 2020. There is however a Floppy Disk extension you can buy to run data on 3" floppies, but that goes inside the cartridge slot. Other than that, there is currently no purpose of that SNES expansion port. However, there is also a similar expansion port on the NES on the bottom that looks like a brick, and that also had plans for a modem, where you can play with people on your NES and on your Sega Genesis called...
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