(Reminder: this list is for questions about the assembler and use of it, not about the behavior of z/OS system services. IBM-Main would be a much better place to ask such questions.)
>but only if the system determines that the RB is dispatchable. >... >Am I to understand that the TCB needs to be in a WAIT state ? No, there is no necessary correlation between 'dispatchable" and "WAIT". Consider a task that is running, then gets interrupted for a time slice. It is still dispatchable. It is just not running, waiting for its next opportunity to be dispatched. Peter Relson z/OS Core Technology Design