dan@charyb.COM (Dan Mick) (12/01/89)
I'm trying to get an HP LJ II hooked up to my 3/50, and I'm having the
devil's own time getting it to work.
After a bit of experimentation, I got the file laserjet-printcap.Z from
a very old comp.misc article, but that goes molasses-slow, as it calls
select(0,0,0,0,<1500 usec timeout>) between *each character*. It's
really horrid, but if I remove the calls, the LJ loses data in ways
I can't understand. I've managed, at least, to turn the timeout down
to 200 us, but I'm still not happy with the performance.
Also, I really don't understand the two filters given (one raw, one
sorta-formatted) or all of the printcap entries, particularly in the
way some tty flags are set from the printcap entry and some from the
filters. I can't get any log messages from lpd, either.
Does anyone have any good results with a LaserJet under any BSD, and/or
SunOS 3.2, and/or can you explain the printcaps and filter stuff below?
lp|lz|laserjet|Hewlett-Packard Laserjet:\
:lp=/dev/ttyb:sd=/usr/spool/lpd:br#9600:pw#132:pl#60:\
:xs#060:fc#0177477:\ <- this stuff in particular
lf=/usr/adm/lpd-errs:\
:of=/usr/local/bin/hpf:vf=/usr/local/bin/lzcat:rs:
An extract from lzcat.c...hpf.c does the same initialization. My questions
are in the ??? comments.
#include <sgtty.h>
lzinit()
{
struct sgttyb nbuf;
unsigned long lbits;
setbuf(stdout, NULL);
/* ??? Okay, maybe there aren't local bit masks in some BSD printcaps..*/
/* Work around to by-pass bug in terminal driver and force LITOUT */
lbits = LMDMBUF|LLITOUT;
ioctl(fileno(stdout), TIOCLSET, &lbits);
/* ??? but do this stuff twice? */
ioctl(fileno(stdout), TIOCGETP, &nbuf);
nbuf.sg_flags &= ~(ECHO|XTABS|CRMOD); /* While we're at it, set the mode */
ioctl(fileno(stdout), TIOCSETP, &nbuf);
fputs("\033&k3G", stdout); /* Set device to sane mode */
}
--
.sig files are idiotic and wasteful.