If the machine
determined, and a
is in supervisor mode,
branch is taken to the
interval timer indicates time slice end for the running user. The clock
comparator indicates that a specified
midnight, scheduled shutdown, or user event reached.
The external console interrupt invokes CP processing to switch from
interrupt handler (FLIH) atte.pts to gain the system lock before
proceeding. If it is already in use, the interrupt status is stacked
and deferred. The interrupted processor then attempts to run a
In an attached processor configuration. only the main processor can
control register 2 on the main processor are initialized to ones to
enable for interrupts fro. any available channel.
processor, the channel masks in control register 2 are initialized to
Part 2. Control