* Interrupt transfers
control to the interrupt service routine generally, through the interrupt
vector, which
contains the addresses of all the service routines.
* Interrupt architecture
must save the address of the interrupted instruction.
* Incoming interrupts are disabled while another interrupt
is being processed to prevent a lost interrupt.
* A trap is a software-generated
interrupt caused either by an error or a user request.
* An operating system is interrupt driven.
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