kkim@uiucdcsm.cs.uiuc.edu (06/14/88)
Subject: Gnuemcs and a 2400 baud modem
I bought a 2400 baud modem and have been using it a few weeks.
I found strange behavior of (probably) Gnuemacs. When I do Ctrl-V
(next page) several times consecutively, sometimes
what the screen shows is not the same as the file contents:
some (line numbers are roughly 3-5) lines have garbage characters
and some (line numbers are roughly 8-12) lines show nothing.
The lines garbled are lines 3-12 most of the time;
the garbage characters vary just a little from trial to trial.
When I do Ctrl-V, there are different cases according to
how the screen is drawn, two of them are:
type 1 drawing: the screen is redrawn beginning with the home
position (row 1, col 1),
type 2 drawing: the bottom 2 lines are moved up and line 3
and following lines are drwan.
The problem occurs only with type 2 drawing. I dont think it is
a problem with the modem, since there has been no problem at all.
I did open-termscript when the connection was made at both 1200 and
2400 baud. There was no difference in the termscript files (I did "diff").
My (temporary) cure is to specify padding for al (add a new line)
and dl (delete a line) entries in the termcap file:
:al=1*\EE:\
:dl=1*\ER:\
Then type 2 drawing is changed to type 1 drawing and the problem is
cured.
I wonder if anybody else has the same problem at 2400 baud?
My terminal is Qume QVT-101 and a modem is Practical Peripherals PM2400SA.
Also there is an "annex" box between the host computer (vax780, multimax)
and the modem on the host side.
Any comments? Thanks in advance.
Kyongsok Kim
Dept. of C.S.; Univ. of Illinois at Urbana-Champaign
Arpa Internet/CSnet: kkim@a.cs.uiuc.edu
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