It had a competitor, ASP ( Attached Support Processor ), which ran on one mainframe and controlled scheduling of other attached mainframes.
2.
In 1976 IBM provided another option, JES3 ( Job Entry Subsystem 3 ), a descendant of ASP ( Attached Support Processor ), which allows one CPU to manage a single job queue feeding work to several physically distinct CPUs, and therefore allows one operator's console to manage the work of all those CPUs.
3.
"' JES3 "'( "'Job Entry Subsystem 3 "') is similarly descended from the Attached Support Processor ( ASP ), which was IBM's initially preferred system for OS / 360 " unit record I / O ", although JES2's " shared SPOOL " program product ( NJE ) ultimately displaced JES3 ( and even JES2 ) in many cases.
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