I can't seem to find one. I just want to keep my old ISA 56k modem which I dearly love and which can stay up for DAYS and constantly connects at 52000 and has callerID and answering machine functions. It's an Archtek 5634BTS hardware modem and I've never found it's equal. I like this modem so much I'm considering sticking with an SDR motherboard like the KT7E if there isn't anything DDR out there with an ISA slot.