Thank you Fobotcso - have returned to post a 'Belay my last pipe' message. Tucked away in a 'safe' place was a slip of paper which foresaw the problem and offered the solution - set the port as SPP and the memory address as 378H. :o Having done that and re-installed PSP (which overwrote some of the drivers), everything is now working as advertised - phew!!
Again, thank you 'F' for the offer and for past help. This is a super forum with a reassuringly knowledgeable set of contributors. You have helped restore my halo
