The drivers for Windows 9x, Windows NT 4.0 and Windows 2000 are equally version 2.12.10 (February 29., 2000.). They provide stable operation with RWS-56PCI software modem of Speedcom - a lot more stable than the driver on the included CD-ROM (I tried with Win98, Win98SE and Win2000).
I downloaded them from Speedcom's site, but unfortunately it has since been removed.
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