terminals on planar serial port RS232C interface

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3 total messages Started by Edwin Tisdale Fri, 13 Nov 1992 03:52

#1037

Author: Edwin Tisdale
Date: Fri, 13 Nov 1992 03:52

46 lines
2271 bytes

We a have terminals connected to the psp - planar serial port RS232C interface.
The terminal attached to the `S2' port usually displays the following prompt:

Academic Information Systems 4.3 (unix) (ttys0)

login: 

and permits me to `login' and work.  But eventually, output to the terminal
will suddenly stop.  And I will not be able to restart it from the terminal.
I can login from another workstation and kill the terminal session.  But the
process remains in an `<exiting>' condition:

unix% ps -gx
  PID TT STAT  TIME COMMAND
  695 p0 S     0:00 -csh (csh)
  716 p1 R     0:00 ps -gx
  704 s0 S     0:00 -csh (csh)
unix% kill -9 704
unix% ps -gx
  PID TT STAT  TIME COMMAND
  695 p0 I     0:00 -csh (csh)
  717 p1 R     0:00 ps -gx
  704 s0 S     0:00 <exiting>
unix% 

And I cannot use the terminal again unless I reboot or enter something on
the terminal attached to the `S1' port.  Then that terminal will freeze
until I enter something on the terminal attached to the `S2' port again
which will in turn freeze and so on.  This behavior will continue until 
I reboot the system.

I would appreciate any advice I can get to help me solve this problem.
The following information may be useful:

unix% stty everything
new tty, speed 19200 baud, 32 rows, 80 columns
even odd -raw -nl echo -lcase -tandem tabs -cbreak 
crt: (crtbs crterase crtkill ctlecho) -tostop 
-tilde -flusho -mdmbuf -litout -pass8 -nohang 
-pendin -decctlq -noflsh 
erase  kill   werase rprnt  flush  lnext  susp   intr   quit   stop   eof
^?     ^X     ^W     ^R     ^O     ^V     ^Z/^Y  ^C     ^\     ^S/^Q  ^D     
unix% cat /etc/motd
4.3 BSD UNIX (6151) #1: Thu Jul 27 15:00:42 PDT 1989

Thanks in advance, Bob Tisdale (edwin@maui.cs.ucla.edu)

Re: terminals on planar serial port RS232C interface

#1226

Author: Tod McQuillin
Date: Sun, 15 Nov 1992 19:34

24 lines
1647 bytes

honey@citi.umich.edu (Peter Honeyman) writes:
> > If you're into high-performance serial I/O, I have a heavily hacked
> > asy.c (thanks to Tim Theisen) which does 38400 bps (with 16550 uarts)
> > pretty well.
> 
> is that the async driver we hacked up at citi, or is there something
> new?  (i'm running at 57.6 kbps.)

This is the one, Peter; sorry I didn't give you credit.

In all fairness, the code is almost entirely Mr. Honeyman's, with only
minor changes by Mr. Theisen (to better support PC serial cards, as I
recall).  I also added in my own changes, because a floating
carrier-detect line on an attached terminal was causing serial I/O to
hang on the port.*

Anyhow, I certainly sould have mentioned Peter Honeyman, because even
though his name isn't at the top of the RCS changelogs anymore, it
certainly appears next to most of the changes!

--tod

*This involved a slight hack to only check the status of the carrier
detect line when an MSR interrupt was received.

Re: terminals on planar serial port RS232C interface

#1228

Author: Peter Honeyman
Date: Mon, 16 Nov 1992 13:34

4 lines
748 bytes

er, thanks.  i wasn't looking for credit, just new code.  but thanks
again.

	peter

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