A few years ago, someone decided to donate the original source code of "System R" to the Computer History Museum. For those who don't know what this is: The first relational database, a research prototype built by IBM in the late 70s: after Ted Codd invented the "Relational Calculus", a group around Don Chamberlin built an actual system around it, with SQL as the query language. The connection between IBM Research and the Museum was my manager. He started looking for someone who could read the ancient MVS-format backup tape, and it so happened that I had ancient software (from the late 80s) which ran on Unix and decoded the MVS backup tapes (which included converting EBCDIC to ASCII, which is not possible while preserving PL/S syntax). So I got to turn the backup tape turned into a tar file. I have no idea how one can get to the source today.