the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections ...

This idea had been floating around in [waterbury]’s head for years now, and with a Raspberry Pi he can finally make ... An SNES cartridge need 16 address pins, 8 data pins, 8 bank control ...