Looking at #NiklausWirth's #Oberon compiler I am going back to the NS32000 code in the dead tree edition of #ProjectOberon, because in the version I found on the net the description of RISC-0/RISC-5 in chapter 16 is not covering the complete instruction set used for the code examples in chapter 12.2. (I don't know if there is an official printed edition of the book that covers the "more recent" changes.)
Using #oberon risc emu becomes much easier when you can edit source code from the comfort of your modern editor. Uploads modified files automatically to your running #projectoberon system.
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Project Oberon: The Design of an Operating System, a Compiler, and a Computer

@EdS Never mind I should have looked more closely. I see #ProjectOberon and the #Oberon programming language family are related.