On 2013-04-05 19:32, Bob Armstrong wrote: Mod2 and Mod3 were done in DEC research group, mostly by from ex-PARC folks that had done Cedar et al I can't say for sure, but I think the one I have (which I posted to this group a while ago) descends from Niklaus himself. From the MVCOMPILER.MOD file - (**************************************** * * * MODULA-2 Multi-Pass Compiler * * **************************** * * * * VAX/VMS Implementation * * * * * * MVCompiler: * * * * private part of the common base * * of the Modula-2 compiler * * * * Version 3.1 of 1-FEB-1983 * * * * * * * * Based on PDP11 Implementation: * * Version M22 of 17.03.81 * * * * Institut fuer Informatik * * ETH-Zuerich * * CH-8092 Zuerich * * * ****************************************) Ooo. I have almost all the parts of the PDP-11 implementation. Missing one file or two... You don't happen to have more of this stuff, do you? Johnny