None of these mention APIC, so I assume they are written about machines without APIC support. I'm sure what you claim was true in 1998, but is not true on any modern PC.

Here are some links about APIC and IO-APIC.

http://www.microsoft.com/whdc/system/sysperf/apic.mspx
http://osdev.berlios.de/pic.html
http://www.tek-tips.com/faqs.cfm?fid=4455
http://www.asteriskguru.com/tutorials/pci_irq_apic_tdm_ticks_te410p_te405p_noise.html

MANY other types of cards have issue with sharing IRQs. This seems to be especially common with audio cards.

Matt wrote:
Sure, not a problem.

http://www.pcguide.com/ref/mbsys/res/irq/num.htm
*IRQ Number:* The number of the IRQ from 0 to 15.

http://www.pcnineoneone.com/howto/irq1.html

http://www.computerhope.com/irqs.htm
No, unfortunately with PCs they are limited to 00-15.
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