Assigning Interrupt Levels

Assigning Interrupt Levels

A rotational interrupt technique is used to configure PCI adapters. This technique enables the installation of PCI adapters that currently do not support sharing of PCI interrupts.

Always use the IBM PC Server EISA Configuration Diskette for the system you are servicing when assigning interrupts for EISA and ISA adapters. You cannot assign an EISA or ISA adapter the same interrupt that you have assigned to a PCI adapter. This is because the server does not support interrupt sharing among PCI, EISA, and ISA adapters.

If a situation occurs where you need an additional interrupt, you can use an interrupt from another function that you might not need, such as COM2 (Interrupt 3) or parallel port (Interrupt 5 or 7).

See Typical ISA/PCI - Bus, DMA and IRQ assignments.

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