Thanks to everyone who got back to me with ideas. Here are several links that helped me.
https://www.youtube.com/watch?v=ivdu5-TOqhI This is from dfortae. He's very good and easy to understand. I may use him again to move more data from an old DOS CPU to my new Windows machine.
Someone else sent me some helpful material but he may prefer me not to make that public. He was also very helpful.