ground on Sam adapting a Oh dear, Alan. I assure you there was no intention of causing offence. I took Sam's "Exactly" as referring to the last sentence of my paragraph. My description was "exactly" what he was doing. I had envisaged Sam as having a power supply with a plug on the end, and wanting to know how to wire up a socket in the machine. Later posts suggest that your test would have told Sam what he needed to know, so if it makes any difference, I apologise for my hasty criticism of your suggestion. But please bear in mind (you're new to the list aren't you?) that on Classiccmp, we all treat the other subscribers as old friends, and seldom stand on ceremony. Remarks like those above are not intended personally. Philip.