Quote from Uwatec's South African (huh?) website;
Updated 32 bit Datatrak Software application for Windows 98, 98SE, ME, 2000 and XP. Serial communication renewed to work with to serial (RS-232) converters. With help of this kind of converter, MemoMouse can now be connected to USB port.
Inmac have them in, for example;
http://www.inmac.co.uk/product.aspx?SKU=E249486
HTH.
Mark.