The Manx Catalog archives computer manuals, and there are a great many to be found there: "22165 manuals, 10104 of which are online, at 61 websites." It's an archive of archives! Manx covers the ...

An unfortunate reality of pre-1990s computer systems is that any manuals and documentation that came with them likely only existed on paper. That’s not to say there aren’t scanned-in (PDF) copies of ...