Michael, Thanks for replying.

Trace.String?

Yes, Trace.String appears elsewhere in Unix.Machine.Mod. I should have noticed that Trace is imported and then searched to see it used. =8~/ Adding Trace.String("...") at the beginning of the body of Unix.Machine.Mod doesn't produce output in KernelLog. The output might be elsewhere. I'll hunt. =8~)

KernelLog.String?

Didn't succeed to recompile with that added. Thanks again, ... P.L. -- VoIP: +1 604 670 0140 work: https://en.wikibooks.org/wiki/User:PeterEasthope