Overlay (programming): Difference between revisions

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</ref> in [[IBSYS]]/IBJOB, including including a tree structure and automatic loading of links as part of CALL processing.
 
In OS/360, IBM extended the overlay facility of IBLDR by allowing an overlay program to have independent overlay regions, each with its own overlay tree. OS/360 also had a simpler overlay system for transient [[Supervisor call|SVC]] routines, using 1024-byte SVC transient areas.