>if SVCs architecturally have this restriction SVCs do not architecturally have this restriction.
Given what I know in general (not specific to USS), I would not make the assumption that "...because the SVC 144 routine uses register 14 to exit" is true. It might be true that a modification to register 14 is lost, but this is not the reason. Conceivably the designer/coder of that routine that it was true, but that doesn't make it true. I'll see if I can track down someone who knows. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
