So, @nil0bject brought us the following quote from a book, in the MacsBug 6.6.3 page, some months back:
On Macintosh programming : advanced techniques I Daniel K. Allen.
ISBN 0-201-51737-XDisAsm - C tool
This tool allows data forks and individual resources to be disassembled such that the resulting disassembly can be reassembled later. It is useful for exploring static code modules; MacsBug is the tool to use for exploring running code. In fact, to get the source code to MacsBug-with no comments-disassemble MacsBug's data fork with this tool.
Does anyone have that "DisAsm" / "DisAsm - C tool" app? It'd be interesting to locate it and have it here.