Very Computer

by **slavin..** » Wed, 15 Sep 1999 04:00:00

Hello,

I have an issue with the /dev/cua/a port where the modem is installed.
If I run tip on that port, I can talk to the modem, but there's some
kind of buffering effect (one-keystroke delay), where I need to press a
key in order for previously typed character to appear. I suspected
wrong stty options, so I tried to change them as root. Well, turns out
that stty doesn't reflect any changes I'm trying to make! If I try to
run stty < /dev/cua/a -a, I get a list of current settings. Then I do
(for example) stty < /dev/cua/a crtscts, and get no errors. But when I
list the settings again, nothing has changed! The stty man page says
that the command acts only on stdin device - but how do I control
non-stdin devices? I'm having this issue both in Solaris and FreeBSD.
I'm sure it's something simple, I wonder what I'm missing. BTW, what's
the stty parameter that removes this buffering effect I'm experiencing?

By the way, those who now about my printer troubles, I'm still trying to
find a solution...

Thanks very much.

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by **Roland Titz** » Thu, 16 Sep 1999 04:00:00

> Hello,

> I have an issue with the /dev/cua/a port where the modem is installed.
> If I run tip on that port, I can talk to the modem, but there's some
> kind of buffering effect (one-keystroke delay), where I need to press a
> key in order for previously typed character to appear. I suspected
> wrong stty options, so I tried to change them as root. Well, turns out
> that stty doesn't reflect any changes I'm trying to make! If I try to
> run stty < /dev/cua/a -a, I get a list of current settings. Then I do
> (for example) stty < /dev/cua/a crtscts, and get no errors. But when I
> list the settings again, nothing has changed! The stty man page says
> that the command acts only on stdin device - but how do I control
> non-stdin devices? I'm having this issue both in Solaris and FreeBSD.
> I'm sure it's something simple, I wonder what I'm missing. BTW, what's
> the stty parameter that removes this buffering effect I'm experiencing?

> By the way, those who now about my printer troubles, I'm still trying to
> find a solution...

This is normal behaviour. The problem is that the tty will be reinitialized
with the system default settings if no process use this tty.
You can workaround this using:

# cat </dev/cua/a &
# stty <your new settings> </dev/cua/a

Afterwards the new settings should be active:-)
Another way is to modify the ttymon configuration.
--

Regards
Roland Titze

by **Philip Bro** » Thu, 16 Sep 1999 04:00:00

different stty question :-)

Lately, I've been noticing that telnet to certain remote machines
has been dropping characters in vi.
both ends are solaris. one is solaris 2.6, one is 7.

I think this is a holdover from the old days of 300baudmodems, when
curses suddenly decides to "optimize" screen updates.

My question is: How the heck to I disable this "feature"?
I have a feeling it is also an stty issue, but I'm not sure.

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