This is what you're going to do. Let's say that a RISC processor takes 2 microseconds to do each instruction, and that an I/O device can only wait 1 millisecond before its interrupt is handled. When...

This is what you're going to do. Let's say that a RISC processor takes 2 microseconds to do each instruction, and that an I/O device can only wait 1 millisecond before its interrupt is handled. When interrupts are turned off, how many instructions can be run?