If an (at the time) mandatory unknown key is encountered, the program should jump to [[#LoaderReturnAddr]] with <code>result_code=346 | (1<<9);</code>.
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If an (at the time) mandatory unknown key is encountered, the program should jump to [[#LoaderReturnAddr]] with <code>result_code=346 | ((100 + key) << 9);</code>.
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If a key that is mandatory is not found (for example with an outdated loader), use <code>result_code=346 | ((200 + key) << 9);</code>.