History of exception/error management

[debnarayan]

I was wondering about exception handling mechanism lately. Few questions I could not find any answers to..... 1. How did Babbage did similar things in the analytical engine? Was this required? Or the large computing instruments with vaccuum valves? 2. What can be the exact sequence of evolution of such concept? [say unpredictable result >> predictable return values >> standardised hresult values >> exceptions]