Thank you for both replies. I had thought that older/original lens, backs, etc. should work but wanted some corroboration and my web searches hadn't got me that information.
I have the normal lens, a 50 and a 150 lens as well as a teleconverter and an automatic bellows along with a 120 and a 220 back.
I am having problems with the shutter release mechanism which is not battery related (I think).
Oh, and yes I did check the battery (good advice by the way). At one time it was in backwards but I had sorted that out earlier.
Even though it shows a voltage of 6.1 V on my meter I will get another battery and check it out.
I need to sort out my shutter problems though.