PNtalk 96
This version of PNtalk system was implemented in 1996 in VisualWorks Smalltalk. From 1997 to 2000 it was significantly improved mainly to reach better stability of its user interface. But it slightly differs from today's version of OOPN definition and PNtalk language - synchronous ports are not implemented. It has so-called predicates instead. A predicate is a kind of synchronous port without side effect (only for testing object's state).
PNtalk 96 has its own WWW pages prepared by its main implementor - Tomas Vojnar:
Note that the main purpose of this PNtalk system implementation is demonstration of the OOPN priciples. Now we are working on a new PNtalk system implementation which will be better suitable for serious applications. The new PNtalk system implementation will not be available before 2005.
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