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With my new project (running a BBS on my Macintosh SE in System 6) using SubText an amazing modern BBS software server from JCS (Joshua Stein) I’ve encountered some System Errors- and like most things on the Internet today they are hard to google for (it seems like the world just searches for OSX info).
JCS however has a very service able resource for these Error Codes, in his source for the SubText BBS. Oh and he also developed a web-viewable software repository system for System 6 developers called Amend. Here is the Amend link for the error codes:
MacTCP.h – error codes around line 100.