开云体育

On Sun, Feb 5, 2023 at 05:16 PM, Bob Polmanter wrote:

SVC 6 is LINK

That's the one I was looking for! So I need to go digging into the OS/VS* manuals. Oh bother. Now to find the proper manual "over there."

Page 258 backs up your recollection.

CMS supports selected SVC calls generated by as and DOS/VS macros, by
simulating the effect of these macro calls. DMSITS is the initial SVC
interrupt handler. If the SET DOS command has been issued, a flag in
NUCON will indicate that DOS/VS macro simulation is to be used. Control
is then passed to DMSITS. Otherwise, as macro simulation is assumed and
DMSITS passes control to the appropriate OS simulation routine.

?... Mark S.