Hi Walter
Many thanks for your reply and your assistance – but I am still a little confused. You see I have been using the same Macpro now for about 8 years, editing with FCP v6&7 and I have been able to output interlaced or progressive video to my ext monitor as I so choose via audio/video settings in FCP.
It’s this setting choice that I do not seem to have on my new iMac using Premier Pro.
Did you mean that no iMac can output interlaced video to an ext monitor – rather than no mac generally?
Many thanks again for your help.
Roy Stewart