Interrupts are very important to the operation of any computer. Interrupts give the processor the ability to respond quickly to its peripherals (such as the keyboard and the hard disk) and to the outside world in general. Without interrupts, a processor would be unable to service more than one task efficiently and reliably. The importance of the interrupt is illustrated when comparing an interrupt to a doorbell. If your door did not have a doorbell, you would have to periodically go to the door to see if anyone happened to be there at that time. Of course, that would be very inefficient. With a doorbell, you only need to go to the door when the doorbell rings, and you are then confident that someone is there waiting.
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The Microsoft(R) Guide for Assembly Language and C Programmers
By Ray Duncan
PROGRAMMING FOR MS-DOS
Genealogy of MS-DOS
MS-DOS in Operation
Structure of MS-DOS Application Programs
MS-DOS Programming Tools
Keyboard and Mouse Input
Video Display
Printer and Serial Port
File Management
Volumes and Directories
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