How did you try to change the irq and port for setserial? I have managed to get the driver working but not for an AMR slot (PCI).
The driver which I used was from:
Although I can get my modem to dial out I still have a problem logging into an ISP which suggests that the driver isn't complete.
If you goto the part where you can download the driver it says it is for AMR modems as well.
I wouldn't bother trying the HCF cus I don't think that there are any drivers for it at all.