Some software packages written in assembly during the 70s and 80s are still in production today, and may be difficult and expensive to replace. I did some contr

Some software packages written in assembly during the 70s and 80s are still in production today, and may be difficult and expensive to replace. I did some contract work for a steel plant in 2018. The primary control system for the plant was written in assembly. They were in the middle of doing a full rewrite, but in the meantime, they had to do maintenance and bugfixing for the in-production system in assembly.