@gosha @weekend_editor There's a document on it on their website:
tumbleweed.nu/r/lm-3/uv/amber.

the tl;dr is it was a proto-TCP/IP ethernet combination that was hacked together in the 70's to allow various lisp machines to network together and support a shared filesystem. The 'Global Chaosnet' refers to an effort to tunnel chaosnet protocols in modern TCP/IP connections to allow old networking programs to communicate over the modern internet