Dispatcher loops through the LSMQ and move the SRB to LSPL of each address space the SRB associated with. Each time an SRM is moved to the list, dispatcher invoke MSR and at the end, PSAANEW would contain the highest priority ASCB.
Dispatcher compare PSAANEW and PSAAOLD to determine if a higher priority address space is now ready. If yes, it load the segment origin to CR1. Dispatcher will then look for work in the address space until all done. It the. Switch to the next priority highest address space.
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