QuickDev16 card offers SNES homebrew
The Quickdev16 card, which plugs into an SNES, offers quick and easy access to SNES homebrew — the cartridge packs an Atmel AVR ATmega644 chip with a boot loader, a USB connection with which to upload a ROM, 16 megabits of SRAM, plus an RS232 converter (whatever that is). Who whole (tiny) package can be had for only $120 — cheap, when considering we’re talking about “game development” here. If you’re up to it, there’s more details about the card here.