you could rebuild it in any turing-complete language, including Brainfuck. But why would you do that? I suspect there’s few good reasons for doing it (ease of

you could rebuild it in any turing-complete language, including Brainfuck. But why would you do that? I suspect there’s few good reasons for doing it (ease of finding new programmers) and many good reasons not to do it (speed, it’s code that has been battle-tested for ages). Anyway, from friends working in the banking sector, nowadays the mainframe code is exposing an API and users are accessing data via a web interface and not a terminal emulator anymore.