The "Z-Machine Standards Document"[1] has an appendix[2] with a very brief summary of the history of the Z-Machine; several of the other sections have tables (f

The "Z-Machine Standards Document"[1] has an appendix[2] with a very brief summary of the history of the Z-Machine; several of the other sections have tables (for the opcodes, and header formats, etc) with "V" or "Version" column showing when features were introduced. [1] http://inform-fiction.org/zmachine/standards/z1point1/index.html http://inform-fiction.org/zmachine/standards/z1point1/index.... [2] http://inform-fiction.org/zmachine/standards/z1point1/appd.html http://inform-fiction.org/zmachine/standards/z1point1/appd.h...