Off-topic but I used to do security assessments and had a bunch of small banks for customers. One of them was still running the banking software they had when they first got computerized and it ran on an HP3000 from the 70s. Over the years reliable hardware became impossible to find, so they bought some emulator software and ran it on Windows. I don't know why but it always made me chuckle.

That thing did *not* like port scans. (I warned 'em! :D)