Don't know if I'm following the problem exactly or not.
But usually you have to check the documentation with the card. For example I have some old Digital cards and they have IRQ's possible of 5, 10, 11, 15. All the selections should be via jumpers on the board. In the doc it discusses what to do in case of conflicts, including addressing.
The old DOS programs like "In-the-Box" or "Check-It" were useful for figuring out IRQ assignments and what was open. Usually it had to be a high number, 5 is normally already taken.
If the problem is in the software, a reference like "PC Interrrupts" Ralf Brown & Jim Kyle is useful.
But usually you have to check the documentation with the card. For example I have some old Digital cards and they have IRQ's possible of 5, 10, 11, 15. All the selections should be via jumpers on the board. In the doc it discusses what to do in case of conflicts, including addressing.
The old DOS programs like "In-the-Box" or "Check-It" were useful for figuring out IRQ assignments and what was open. Usually it had to be a high number, 5 is normally already taken.
If the problem is in the software, a reference like "PC Interrrupts" Ralf Brown & Jim Kyle is useful.