There is documentation for the MI instructions, but that generates an OPM program and not an ILE program on IBM i. Sadly the TIMI isn't really documented anywhe

There is documentation for the MI instructions, but that generates an OPM program and not an ILE program on IBM i. Sadly the TIMI isn't really documented anywhere - as well as ILE. I have written an RPG3 interpreter with all the Record Level Access operations working on a noDb/flatfile in C#, but lost the source after replacing a hard disk. I have also tried writing a RPG4+ (only free format) compiler for .NET, but it started getting tricky when starting to write the RLA operations because they relied on a database. I have the code still, but it's ugly so I never released it. Would be a fun project, for sure. Not enough hours in the day.