How do I set printer page length?

[HCART at VAX.OXFORD.AC.UK]

    I am sorry to ask what must be a simple question, but nowhere
in my manuals can I find how to set the page length for the
printer on my 3130.  Could someone please tell me what I should add
to the printer interface to specify the number of lines per page?

    Thanks.

    Hugh Cartwright  HCART at vax.oxford.ac.uk