Thanks for you help, Crossbow.
I downloaded (I think) a copy of SYSWIN as part of an online PLC tutorial book (http://www.mikroe.com/old/books/plcbook/plcbook.htm). However, I can't get it to install on my Windows 7 Toshiba laptop, even in 'XP compatible mode'. Do you know here I could get a legal copy of SYSWIN that will run under Win 7?
Other posts on here suggest CX-Programmer is now part of CX-One, the 'all singing, all dancing' version of Omron software that is beyond the means of your average tinkerer. Is it possible to buy a legal copy of CX-Programmer, albeit obsolete, that will let me access all the functions of the CPM1A?
I have seen a USB version of the CQM1-CIF02 on eBay from Hong Kong (yes, I know! - but it's cheap enough to give it a try)
Thanks again,
Ian