IRQ Assignments

  • Thread starter Thread starter Alan
  • Start date Start date
Alan said:
How does Windows assign and handle IRQ 's above the
standard 16?
Click to expand...

AFAIK, Windows NT, 2000 and XP can assign IRQ's above 15 if the
motherboard is equipped with multi-processors, i.e., 2 or more and the
HAL is for multi-processor. OTOH, the current breed of hyperthreading
(HT) CPU's may substitute for multi-processors. IRQ numbers above
15 are supposedly to be "virtual" lines versus physical IRQ lines allocated
for 15 and below.
 

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