[net.unix-wizards] ^D becomes ^L on my VAX Console?

wcs@ho95b.UUCP (11/12/83)

(System: VAX 11/780 using 4.1BSD, LA-120 console)

A significant fraction of the time, when I type control D on my
console, the terminal does a page-feed (^L).  Usually this happens
when I log off, especially between single-user and multi-user modes.

Is this an old bug?  It's low enough priority that I probably won't
hack into the driver to find it, but it's annoying.  Has anyone seen
it before?

		Thanks;
			Bill Stewart
			BTL Holmdel
			ucbvax!ihnp4!ho95b!wcs
			decvax!harpo!ho95b!wcs

mark@qubix.UUCP (Mark Callow) (11/12/83)

I've seen this but it's nothing to do with the console driver.
I have a .logout file which calls "clear".  The problem is in
"clear" or possibly the "tgetstr" routine of termcap.

When the termcap entry doesn't contain a "cl" string instead of
exiting gracefully "clear" sends whatever happens to be in its
buffer which frequently seems to contain a ^L.

Since I rarely use the console I never bothered to fix it.

		Mark Callow, Saratoga, CA
-- 
	Mark Callow, Saratoga, CA.
	...{decvax,ucbvax,ihnp4}!decwrl!
		      ...{ittvax,amd70}!qubix!msc
	decwrl!qubix!msc@Berkeley.ARPA

smk@linus.UUCP (Steven M. Kramer) (11/12/83)

I too have notices that ^D on the VAX console (Decwriter LA-120)
on our 4.1 system produces garbage often including a ^L somewhere.
Othertimes it correctly prints out `logout'.  Is this a software bug
(buffer overrun or scrod pointer  or is it a HW or ucode problem in
the LA 120/console subsystem.  We don't have a LA120 on a RS232 port to
confirm the LA120 end of it.
-- 
	--steve kramer
	{allegra,genrad,ihnp4,utzoo,philabs,uw-beaver}!linus!smk	(UUCP)
	linus!smk@mitre-bedford						(MIL)

cak@PURDUE.ARPA (11/14/83)

From:  Christopher A Kent <cak@PURDUE.ARPA>

It's a (mis)feature of the decwriter III you're using for a console. I
think you need to turn off auto-disconnect via SETUP; that makes it go
away. It's not a bug of the system.

Cheers,
chris
----------

kre@mulga.SUN (Robert Elz) (11/14/83)

Problem is an la120 "feature".  You can defeat it in set up mode.
Its called 'auto-disconnect' or something similar.

			Robert Elz, Melb Uni, Comp Sci (decvax!mulga!kre)

dmmartindale@watcgl.UUCP (Dave Martindale) (11/14/83)

Are you SURE it's turning into ^L, or is it just that the paper formfeeds?
The LA120 has a settable mode which causes it to "hang up the phone" whenever
it receives a ^D.  If this happens, it usually prints some garbage and
spaces the paper up.  Just turning off the feature by going into setup mode
and hitting the appropriate character (I'm nowhere near an LA120 now, so
I can't tell you the key, but the feature is called "remote EOT" or something
similar) will fix the problem.

	Dave Martindale

vrs@uoregon.UUCP (11/23/83)

#R:houxf:-51500:uoregon:400003:000:577
uoregon!vrs    Nov 13 01:38:00 1983

(System: VAX 11/750 using 4.1BSD, LA-120 console)

	A significant fraction of the time, when I type control D on my
	console, the terminal does a page-feed (^L).  Usually this happens
	when I log off, especially between single-user and multi-user modes.

Our system does this too, or rather did.  We switched to dumb LA34s as
console devices (for other reasons) and no longer waste paper.  What I find
annoying is that console output seems to degrade the rest of the system's
performance (our LA34s only go 300 baud, and the system seems to go to
sleep while the LA34 prints).

rbbb.rice%rand-relay@sri-unix.UUCP (11/27/83)

From:  David Chase <rbbb.rice@rand-relay>

The reason your system goes to sleep printing on the console is that the
unix kernel console printf busy waits at some absurdly high IPL, thus
providing reliable debugging output.  This is a feature, I believe.  Lucky
you.  I could flame about robust operating systems and attention to detail,
but there really isn't much point in it.

David Chase, Rice U