Coding a Mandlebrot generator on vintage IBM mainframe hardware
I've been following this story since the author first posted about the idea. I find it fascinating to see someone explore this old hardware. When I was at IBM in the 90's we still had customers with classic hardware in daily usage and it was amazing to see in operation. Much of this hardware was leased so when the customers did decommission it, we disassembled it and brought it back to the branch field office for proper handling, be that scrapping, destruction, recycling, etc. so I often got a real good look at the inner workings.
The way these things were built was just astonishing – those SMS cards for example were built to standards NASA would appreciate – and the author explores some of that in this article.