Installation guide

Console Hardware 1-7
One processor in a multiprocessor system is designated as the primary
processor. Since the primary processor performs the system bootstrap, it is
also referred to as the boot processor. The lowest numbered enabled proc-
essor that has asserted its own boot processor bit is the boot processor. All
console commands execute, by default, on the primary processor.
Under the operating system, secondary processors must communicate with
the primary when they need to perform I/O on the console terminal using
the hardware restart parameter block (HWRPB).
The low portion of main memory is reserved for the console program.
When the system is booted, the console image is preserved in order to fa-
cilitate reentering the console program through a halt condition. In addi-
tion, a number of data structures are created in memory, primarily for
communication between the console program and the operating system.
For more information:
Operations Manual
Advanced Troubleshooting
KN7AA CPU Technical Manual
KA7AA CPU Technical Manual