I'm programming under DOS 6.2. I want to switch the polarity of the interrupt source 5 from "high active" to "low active" so an IRQ appears on a negative edge instead of a positive edge (or level, in my case it's edge).
Does anybody know how to do this in a correct way?
I've seen that there is an APIC controller (connected as PCI-device), but I don't know if this APIC is active under DOS(I don't think so) and I'm not able to address this PCI device because I didn't figure out if it's possible to create 32 bit pointers in a DOS application. Can anybody help me?