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Hello and welcome to the Intel® Embedded Community,Wow, 486DX introduced in 1989, 23 years ago. I have seen similar questions in the community without too much success finding info on these obsolete parts. Below are a few links you might try:First is Intel's available docs covering the Intel Architecture. Some of this might still be relevant to the 486Then you might try some of the third-party sites that specialize in archiving such old docs. Here are 2 I found just by google, which I'm passing on without any endorsement. There are others out there too.Good luck!
J. Felix McNulty
Community Moderator (Intel contractor)