Full instructions on how to build your first set of Retro Modules are available on GitHub.
Since this concept is built around a set of hardware specifications, specifics on actual module hardware are not terribly necessary. Instead, here are some of the supported communication methods: CAN, SPI, I2C, AES, S/PDIF, Component|Super|Composite Video & analog audio. Modules/adapters are built via D-sub connectors, DIN connectors, aircraft-grade connectors, XLR connectors & generic pin headers. Some 'client devices' include older 30 pin Apple devices, GoPro cameras & home theater receivers. Further documentation about drone/FPV, automotive & trailer hardware is pending. Where possible, hardware interfaces considered 'open' will be preferred over license-tied interfaces. We don't want to pay a bunch of fees when building the things.