This might be old news to a lot of people here, but I noticed a fun article on The Register today:
Hardware boffin is building a simulation of an entire IBM S/360 Model 50 mainframe https://www.theregister.com/2022/01/27/ibm_s360_simulation/ The article has a handy link to a post on Ken Shirriff's blog: https://www.righto.com/2022/01/ibm360model50.html While I'm kind of a "DEC guy", I still have a certain nostalgic fondness for the IBM System/360, since that was my first in-depth exposure to computer programming.