"Uncle Bernie" of Apple 1 fame designed an ACI (Apple Cassette Interface) which was revised to only require a single voltage input. This rendered it theoretically compatible with the Briel Computers "Replica 1 Plus." The Replica 1 Plus is an apple 1 hardware 'replica' (not a true "Clone") which uses the same 6502 processor as the original Apple 1. To learn more about my R1+ build, you can check some photos here: https://imgur.com/gallery/zJUsLMA This is the very first time I fed the card actual cassette audio. And it works. An absolute testament to the engineering skills both of Bernie and Mr. Briel. Enjoy :)