Thanks, Lee. But still not quite there yet!
Did what you said about enabling parallel port via Hardwareset.
Wouldn't allow printing on socket://127.0.0.1:9100
Reverted to socket://127.0.0.1 when adding printer, having started again.
This time, many more printer set options available, a whole page, a good sign.
But still won't print test page.
I get the message:
"recoverable: Network host '127.0.0.1' is busy; will retry in 30 seconds..."
, but this state goes on, and on, and on...
Also won't respond to print request from simple text editor.