, I haven't tried them with NT, but I've been quite satisfied with internal 33.6 modems sold under the name "Best Data". I have several of their "336 F" model, which isn't PnP but can be jumpered for at least 8 different IRQs. Well it turns out I got the one here to work I learned how to enable plug and play with pnpisa.sys on the NT disc and all is fine now I am so glad I figured out how to use PnP in NT I thought it was already active although not as functional though as 95, now I am a little bit wiser. James