Files and docs are now or soon will be up here https://archive.org/details/CardiacCardboardIllustrativeAidToComputation
Archive.org has an amazing track record for keeping projects from disappearing into the background dust of our modern worlds. If there is anything that needs placing on that page just let me know.
A collection of documents and images to help build and use a CardIAC for education of computer sciences. Created at Bell Labs