How persistent investigation lead to schematics of Atari ST computer chips unseen for a quarter of a century and Restoring a 27 year old backup. There even may be more as author still did not finished exploring the files.
The floppy disk images also contain netlists, simulation data, and test vectors, among other things, that probably would require the original IC design software to be interpreted. And who knows what is still hidden in there..
Read more about this great find here http://www.chzsoft.de/asic-web/