USB to RS232 port cable driver
When I saw a USB to RS232 port cable up for grabs at a website I immediatly saw the great potential of such a device for my Psion 3MX and Psion 5MX machines! Actually, it had been ages since I connected my beloved machines to a PC.
So I did what everybody does (I presume) and went on a hectic search on the net. I downloaded tens of drivers but nothing seemed to work. Finally I stumbled upon a driver (I don't recall where I found it) which I tried... and it worked right away! So as a service to my fellow Psion adepts, I am putting this driver available for direct download on this page. Do bear in mind that you should not download/try/install this driver if the one that came with your USB-RS232 cable works! You should only consider to download and try this driver if yours doesn't work.

Download driver.
Good luck and let me know how it worked out.