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From: brian@sdcsvax.UUCP (Brian Kantor)
Newsgroups: net.dcom
Subject: Re: need info about problem with hp laser jet (26xx)
Message-ID: <1165@sdcsvax.UUCP>
Date: Sun, 27-Oct-85 22:01:27 EST
Article-I.D.: sdcsvax.1165
Posted: Sun Oct 27 22:01:27 1985
Date-Received: Wed, 30-Oct-85 07:37:40 EST
References: <1118@cp1.UUCP>
Reply-To: brian@sdcsvax.ARPA (Brian Kantor)
Distribution: net
Organization: UCSD wombat breeding society
Lines: 37

In article <1118@cp1.UUCP> hart@cp1.UUCP (rod hart) writes:
>When printing out a document on the inital print only a half 
>page is printed and the rest of the document is lost.  I have 
>checked the print buffer for non printable characters and have 
>not found any characters that could be shuting off the printer 
>or truncating the document.

There is an interesting misfeature in the HP LaserJet - if you send
enough data to it to cause the buffer to fill up and begin printing, you
must send the rest of the data quickly before the printed page gets
beyond where you are printing.

What happens is that the print mechanism will begin to feed paper, and
you have to send data fast enough to get it through the printer before
the appropriate part of the sheet of paper has passed the print head.

Normally the buffer is large enough to handle a page of simple text.
But if you are doing plotting or downloading fonts or other fancy stuff
it might very well be too small.

If you are driving the printer with troff output this might well be your
problem.  The ugly solution is to build a huge buffer in your lp output
filter program and wait until you have the whole page buffered up in the
filter before you start writing to the printer.  Yeech.

I've heard that HP will have an upgrade kit to expand the buffer memory
and maybe some other things too.  No info on when or how much (the local
sales office didn't seem to know anything about it when I called them a
while back).

Hope this helps.

	Brian Kantor	UC San Diego

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