All I / O is performed directly from processes, and the system tables identify which processes have access to which peripherals and handle peripheral interrupts.
2.
These interrupts are also more time consuming because disk accessing is in the order of milliseconds ( as opposed to nanoseconds for memory ) . I'm guessing that because disk operations / memory operation interrupts have priority over peripheral interrupts, that the OS polls your mouse less when disk intensive operations are being performed.
3.
On the B5500, either Processor A or Processor B could be designated as Processor 1 by a switch on the engineer's panel, with the other processor being Processor 2; both processors shared main memory and had hardware access to the I / O processors hence the peripherals, but only Processor 1 could respond to peripheral interrupts.
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