🚀 go-pugleaf

In setting up coroutines in Modula2, the NEWPROCESS procedure
requires that the PROC (coroutine) be a parameterless procedure.
Can anyone assist me with why that is the case? What is the 
underlying mechanism that requires this? 
 I ask, since in my sabbatical work (beginnings of OS research)
Bob Cook at UVA sets up coroutines etc as procedures that
have one integer parameter, then doesn't use NEWPROCESS and
TRANSFER, instead (since we were on Liliths at Virginia), using
some of the procedures and CODE procedures that Wirth published.
I need to implement same OS, and want to do it on a MAC (MAC II)
and thus need to do some assembly lang stuff to do a NEWPROCESS
and TRANSFER (or do I?).
 Any assistance would be appreciated.
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Robert L. Chase                    INTERNET:  rlc@uvacs.cs.virginia.edu
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Robert L. Chase, PO Box AK, Sweet Briar College, Sweet Briar, VA 24595
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