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From: muller%sdcc7@SDCSVAX.UCSD.EDU (Keith Muller)
Newsgroups: comp.laser-printers
Subject: Re: Apple Laserwriter on a 4.3BSD VAX
Message-ID: <8709052035.AA11992@brillig.umd.edu>
Date: Tue, 1-Sep-87 12:58:26 EDT
Article-I.D.: brillig.8709052035.AA11992
Posted: Tue Sep  1 12:58:26 1987
Date-Received: Sat, 12-Sep-87 18:59:59 EDT
References: <8708292030.AA24230@brillig.umd.edu>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of California, San Diego
Lines: 13
Approved: laser-lovers@brillig.umd.edu
Summary: watch out for xc



One thing that burned us is the xc flag to printcap. xc#0 does nothing.
The xc flag is to "clear local bits". Looking at the code this becomes
a ioctl(xx, TIOCLBIC, ....). From tty(4) :
	TIOCLBIC	arg is a point to an int whose value is a mask
			containing the bits to be CLEARED in the local
			mode word
In other words you put a 1 at each bit position you want cleared. This
was causing our laserwriter to get in weird states (make sure the xc is 
before the xs in the printcap file, the same order applies to fc and fs).
	Keith Muller
	University of California, San Diego