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From: wjw@ebf.eb.ele.tue.nl (Willem Jan Withagen)
Newsgroups: comp.sys.apollo,comp.lang.postscript
Subject: Re: Need printcap entry for HP LaserjetII
Keywords: printcap laserjet postscript
Message-ID: <1118@eba.eb.ele.tue.nl>
Date: 27 Mar 91 12:35:45 GMT
References: <1991Mar26.192957.1@imecom.imec.be>
Sender: news@eb.ele.tue.nl (The News system)
Organization: Eindhoven University of Technology, The Netherlands
Lines: 56

In article <1991Mar26.192957.1@imecom.imec.be> elsen@imec.be writes:
=>
=>  Could someone mail me an example printcap entry for
=>  an HP LaserjetII P printer connected to the serial line
=>  of an Apollo 3000 workstation running SR10.2?
=>
=>  The printer also has an optional "Laserjet Poscript" cartridge
=>  installed.
=>
I've got the same sort of problem. Until recently we ran and HP II
just in plain PCL mode. For this we used Dave Funk's PD drivers.

Then we added a postscript emulation cartridge and that's were
the real misery started.

The problem as more to do with the postscript cartridge than with
running Apollo's.

Problem description:
	When running files of a queue, which are mixed postscript
	and PCL there have to be switches from PS <-> PCL.
	Our Pacific PSE can do that. The problem is that after
	the switch the buffer is flushed, and it have contained
	part of the next file to print.

	This results in very wrong printing, to say the least.

Real fix:
	Block the traffic to the printer after a switch, until it
	has switched. The problem is that a PS page could take
	days to print, so doing this on the computer side does not
	really compute.
	It has  to be done from the printer side, which would mean
	a change to the Emulation software.
	It hs to block input upon reception of a switch sequence,
	or not kill the buffer when switching.

Current solution:
	We only run PS.                       

Question:
	- Does anybody know a cartridge which does this right?

Other questions:
	- Has anybody got good PS-filters:
		to generate a header.
		to flush the printer after it sort of hangs,
			because someone send a wrong job.

Thanx,
	Willem jan Withagen.

Eindhoven University of Technology   DomainName:  wjw@eb.ele.tue.nl    
Digital Systems Group, Room EH 10.10 
P.O. 513                             Tel: +31-40-473401
5600 MB Eindhoven                    The Netherlands