Can an interrupt be processed by software without the need for hardware suppport? Assume an x86 architecture.
closed as off topic by Gilles, Stéphane Gimenez, Renan, Ulrich Dangel, jw013 Aug 31 '12 at 20:15
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I think you are mixing what you are trying to ask.
There are hardware interrupts generated by events on various devices.
But you can definitely look at the question here: http://stackoverflow.com/questions/1245809/what-is-int-21h
About DOS Interrupt 21h which was used to handle certain Software Only functions like program exit.