The gerber build files for the SBC-85 Single Board Computer cassette tape interface are available for download. While this board can use the SID and SOD signals from the SBC-85 backplane, it primarily uses the digital I/O header for connection to any type of microcomputer or interface (TTL). Information on the project is on
Hackaday.io and the user manual, gerber build files, etc., is on the
SBC-85.COM project site. Example code is also available on the SBC-85 site.
Regards
Craig