but there's a significant albeit rarely seen or sought for ecosystem for managing software on mainframes the source to which is long lost and the authors deceas

but there's a significant albeit rarely seen or sought for ecosystem for managing software on mainframes the source to which is long lost and the authors deceased and the the machine code is what you have to work with. you can't describe the work as being attractive, but the tooling which exists is first class and has been keeping the world turning safely for a good half century I'd say in reality...