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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.periphs
Subject: Re: HP LaserJet, a quick look
Message-ID: <4573@utzoo.UUCP>
Date: Thu, 1-Nov-84 17:08:52 EST
Article-I.D.: utzoo.4573
Posted: Thu Nov  1 17:08:52 1984
Date-Received: Thu, 1-Nov-84 17:08:52 EST
References: <4434@utzoo.UUCP>
Organization: U of Toronto Zoology
Lines: 25

I've got a bit more info on the LaserJet, from several sources.  If you
get the Service Manual (!), you will find out how to set the baud rate.
The number of choices is modest but includes most of the "reasonable"
speeds.  Note that the Owner's Manual does *not* include this information.

Unfortunately, you are stuck with the need for an 8-bit flow-controlled
path.  Some people have pointed out that the LaserJet is willing to do
flow control via modem-control lines, but this appears to be entirely
undocumented.  Doesn't mean it won't work, just that you can't count
on it working for future planning.  It also means that you need a
serial interface that can do flow control, which many of the cheaper
ones (e.g. DZ11) can't.  Our definitive solution to this one under V7
is to use an unused combination in the tty ioctls (both RAW and CBREAK
bits on) to give us the right behavior.  If you don't have kernel sources,
well, you're screwed.  Lean on your supplier or HP for a fix.

[If anyone actually wants it, our RAW+CBREAK code is simple and available,
although not yet thoroughly tested.]

I am told that downloadable fonts are probably in the LaserJet's future,
and that HP appreciates the desirability of more raster memory.  I have
no time estimate for either of these developments.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry