A section of macro assembler written in 1983/84 that I wrote that validated the MICR encoding on the bottom of a cheque ran as far as I know every day without e

A section of macro assembler written in 1983/84 that I wrote that validated the MICR encoding on the bottom of a cheque ran as far as I know every day without error until at least 2007 processing 30-40% of the daily cheques in a European country It may still be running but all the guys I knew are gone! I'm the reason banks have technical debt. They'd track me down every 10 years or so when a major change was required. I also have a C++ system I architected and built in 1992 still running round the world. The codebase has been refactored to some extent as it was originally designed for Investment Banking but it now runs on line gambling, who'd have thought it?