What are software or soft modems?
So-called “software” modems use the main system processor for both modem control and modem datapump functions, thereby putting a heavy load on the system processor (e.g.., about 22% of a Pentium 300). In the opinion of this author, “software” modems are only suitable for higher-end systems (Pentium 166 and above) with a lot of extra main processor power to burn.