View Full Version : IRQ's

09-03-2000, 04:34 PM
What determines the # of IRQ's the OS or sys m/b

Charles Kozierok
09-03-2000, 06:28 PM
What determines the number of IRQs is IBM, 16 years ago. http://www.PCGuide.com/ubb/smile.gif When the original PC/AT was produced it had two interrupt controllers, cascaded, for a total of 15 IRQs. Clones were produced with the same design for compatibility, and we've been stuck with it ever since. http://www.PCGuide.com/ubb/smile.gif All PCs have the same number, and most use about 75% of them for the same hardware items.
Good question!

Charles M. Kozierok ( ixlubb@PCGuide.com )
Webslave, The PC Guide (http://www.PCGuide.com)
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09-05-2000, 07:22 AM
Go to this web-site:

On the left hand side scroll down to IRQs and select it
this will give you the requested information.