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From: eichelbe@nadc.arpa
Newsgroups: comp.unix.wizards
Subject: Lost characters under 4.3 BSD UNIX
Message-ID: <6456@brl-adm.ARPA>
Date: Mon, 30-Mar-87 16:01:21 EST
Article-I.D.: brl-adm.6456
Posted: Mon Mar 30 16:01:21 1987
Date-Received: Wed, 1-Apr-87 00:44:27 EST
Sender: news@brl-adm.ARPA
Lines: 30

I am bringing up 4.3 BSD on a VAX 11/780.  I have the tapes that come
directly from Berkeley.

We currently use 4.1 BSD UNIX on the VAX in question and use a Sytek
Localnet to connect into the VAX.  With the Localnet you have a box
connected to your terminal via an RS-232 cable, and the box is
connected to a coax cable.  Via this cable you can connect to another
such box which connects into the DH-11 (we have EMULEX DH clones)
distribution panel.  Something called flow control can be set on these
boxes.  Under 4.1 BSD we have XON (use of control S, control Q) set on
the terminal end boxes, and EIA flow set on the VAX distribution panel
boxes.  This works just fine.

Under 4.3 BSD this will not work correctly.  If I type a control S and
then a control Q while "catting" a file (or looking at output from ps
ax) under 4.3 BSD, I lose some characters.  But if I set XON flow on
the VAX distribution panel end's box, everything works just fine (no
characters are lost).

Can someone explain what has changed to make what we do under 4.1 BSD
stop working under 4.3 BSD?  Was the mixing of XON and EIA wrong all
along and it just happened to work?  Maybe there is a parameter in the
dh or tty driver I can play with to stop the character loss with the
XON/EIA mix?  The reason why I want to stick with the XON/EIA mix is a
bit too complex to explain here.  If I can't, though, I won't stick
with it.

Any help would be appreciated.  Thank you.

		Jon Eichelberger