If any reader is having difficulty with a USB to serial adaptor for this
I have found that the drivers for the adaptor are critical. The supplied
driver from Prolific, (version ..........18) works, but windows seems to
have its own copy of the driver (version ..........26), which may well
work, but not with Psiwin. It's a bit of a fiddle but the "correct
version has to be force fed into windows for every session