>Is there ever a "need" to write an SVC? There are few reasons that come to mind, and none that are likely truly needed outside of the operating system.
>Or to put it another way, is there sometimes a need to get >OS services from a problem state program like in an SVC? Yes >And if so, are PC routines the new way? If by "new" you mean "for 30+ years", yes (25 years or so if you want a stacking PC). >Were once SVC's ok, and now they are not preferred? PC did not used to exist initially. SVC was the only choice at that time. Peter Relson z/OS Core Technology Design
