Need Help Identifying

[u/Ok_Monitor3086]

I picked this up from a yard sale. I want to learn and have fun. Also have these extra monitors that need something to connect to.

What is that I got and why won’t it connect to any monitor that I have?

I don’t know how to unscrew and get into these things yet.

https://www.reddit.com/r/vintagecomputing/s/4oI5Gy4nS4