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From: Doug Gwyn (VLD/VMB) 
Newsgroups: net.unix-wizards
Subject: Re:  print filter
Message-ID: <6994@brl-tgr.ARPA>
Date: Fri, 4-Jan-85 13:13:53 EST
Article-I.D.: brl-tgr.6994
Posted: Fri Jan  4 13:13:53 1985
Date-Received: Sun, 6-Jan-85 00:03:50 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 5

What you need is an "overstrike" filter, assuming the non-backspacing
printer can do a carriage-return without also advancing the line.
John Quarterman did one of these and I adapted it for distribution
as part of the Multiple-Device Queueing System (MDQS) distributed by
Doug Kingston .