ske@pkmab.se (Kristoffer Eriksson) (02/14/89)
When I use MS-kermit (ver 2.3*) at 19200 bps on an ALR 386/220 or at
9600 bps on a Compaq Deskpro 286, and type anything at the same time
as I receive something, kermit beeps at me an looses received characters.
Is this expected behavior? Can I do something to avoid it? Can't kermit
keep up with the interrupt rate even on a 386, or isn't it even using
interrupts on these machines?
Kermit is practically useless as a terminal emulator to run full screen
editing through, if I can't type anything at the same time as the screen
updates. And lower baudrates are too anoying to use.
--
Kristoffer Eriksson, Peridot Konsult AB, Hagagatan 6, S-703 40 Oerebro, Sweden
Phone: +46 19-13 03 60 ! e-mail: ske@pkmab.se
Fax: +46 19-11 51 03 ! or ...{uunet,mcvax}!enea!kullmar!pkmab!skecdold@starfish.Convergent.COM (Clarence Dold) (02/16/89)
From article <667@pkmab.se>, by ske@pkmab.se (Kristoffer Eriksson): > When I use MS-kermit (ver 2.3*) at 19200 bps on an ALR 386/220 or at > 9600 bps on a Compaq Deskpro 286, and type anything at the same time > as I receive something, kermit beeps at me an looses received characters. I use MS-Kermit 2.31 at 9600, 19.2, and occasionally 38.4 on both a 16MHz 386, and an 8MHz 286. I have some dropped characters at 38.4k, but I'm not certain if it is the fault of Kermit, as I also have trouble on a Link 220 terminal at 38.4. At 19.2, on either PC-AT clone, I have no trouble. If you are running UNIX, make sure that stty -a returns ixon ixoff -ixany. The default on our systems is -ixoff ixany, the result being that when Kermit gives an XOFF, your next keystroke is seen as IXANY, and turns the flow back on. Yes it does need XON/XOFF at 19.2, so does a DEC vt100 terminal. -- Clarence A Dold - cdold@starfish.Convergent.COM (408) 434-2083 ...pyramid!ctnews!professo!dold MailStop 18-011 P.O.Box 6685, San Jose, CA 95150-6685
ske@pkmab.se (Kristoffer Eriksson) (02/17/89)
In article <943@starfish.Convergent.COM>, cdold@starfish.Convergent.COM (Clarence Dold) writes: > From article <667@pkmab.se>, by ske@pkmab.se (Kristoffer Eriksson): >> When I use MS-kermit (ver 2.3*) at 19200 bps on an ALR 386/220 or at >> 9600 bps on a Compaq Deskpro 286, and type anything at the same time >> as I receive something, kermit beeps at me an looses received characters. > > If you are running UNIX, make sure that stty -a returns ixon ixoff -ixany. > The default on our systems is -ixoff ixany, the result being that > when Kermit gives an XOFF, your next keystroke is seen as IXANY, and turns > the flow back on. My principal use of MS-Kermit is indeed for connecting to UNIX systems. And indeed I usually use ixon -ixoff ixany. But I've tried your advice now, and it didn't help at all. I made some more extensive tests, and found that Kermit starts beeping and loosing characters almost immediately when I type anything while output is going on to the screen, but starts emitting xoff:s much later. (I do have flow control set to xon/xoff in Kermit.) I even loose characters when there are less-than-one-line bursts of output with pauses inbetween (and I type heavily), in which case Kermit couldn't possibly need flow control. I really wonder why Kermit beeps. It can't just beep by accident. It should meen something. -- Kristoffer Eriksson, Peridot Konsult AB, Hagagatan 6, S-703 40 Oerebro, Sweden Phone: +46 19-13 03 60 ! e-mail: ske@pkmab.se Fax: +46 19-11 51 03 ! or ...{uunet,mcvax}!enea!kullmar!pkmab!ske
dik@uva.UUCP (Casper H.S. Dik) (02/18/89)
In article <675@pkmab.se> ske@pkmab.se (Kristoffer Eriksson) writes: >>> When I use MS-kermit (ver 2.3*) at 19200 bps on an ALR 386/220 or at >>> 9600 bps on a Compaq Deskpro 286, and type anything at the same time >>> as I receive something, kermit beeps at me an looses received characters. >> >My principal use of MS-Kermit is indeed for connecting to UNIX systems. And >indeed I usually use ixon -ixoff ixany. But I've tried your advice now, and >it didn't help at all. > >I made some more extensive tests, and found that Kermit starts beeping and >loosing characters almost immediately when I type anything while output is >going on to the screen, but starts emitting xoff:s much later. (I do have >flow control set to xon/xoff in Kermit.) > >I really wonder why Kermit beeps. It can't just beep by accident. It should >meen something. Kermit beeps on purpose. When it gets an serial-i/o interrupt it checks the status of the UART and if it indicates it lost a char, Kermit outputs a beep. (I have the sources - I wondered what the beep meant too) The problem has nothing to do with flow control. In the time it takes to scroll the screen, more than one character can arrive. I believe the problem lies in the disabling of interrupts during scrolling, Kermit calls the Bios to scroll with INT 10H. This disables interrupts. Currently I use a TB+ with Kermit on a 8MHz PC-XT clone. The problem occurs when I use 19200baud on a 24 * 80 screen. It also occurs when I use kermit at 9600 on a 24 * 132 screen. In tektronics mode, no UART overruns occur, indicating that Kermit can handle these high speeds with flow control. My diagnosis was more or less confirmed when I tried to use Procomm 2.4.2. Same problem there. I know this isn't much help but now you know what's wrong. >Kristoffer Eriksson, Peridot Konsult AB, Hagagatan 6, S-703 40 Oerebro, Sweden >Phone: +46 19-13 03 60 ! e-mail: ske@pkmab.se >Fax: +46 19-11 51 03 ! or ...{uunet,mcvax}!enea!kullmar!pkmab!ske --cd Casper H.S. Dik University of Amsterdam | dik@uva.uucp The Netherlands | ...!uunet!mcvax!uva!dik
ske@pkmab.se (Kristoffer Eriksson) (02/22/89)
In article <643@uva.UUCP>, dik@uva.UUCP (Casper H.S. Dik) writes: > Kermit beeps on purpose. When it gets an serial-i/o interrupt it checks > the status of the UART and if it indicates it lost a char, Kermit > outputs a beep. (I have the sources - I wondered what the beep meant too) > > The problem has nothing to do with flow control. In the time it takes to > scroll the screen, more than one character can arrive. > I believe the problem lies in the disabling of interrupts during scrolling, > Kermit calls the Bios to scroll with INT 10H. This disables interrupts. > > My diagnosis was more or less confirmed when I tried to use Procomm 2.4.2. > Same problem there. I have discovered that this character-loss problem occurs when I use a KEYB to remap the keyboard layout for our national requirements. When I use plain US keyboard layout, Kermit doesn't beep, and doesn't loose characters. I usually use the swedish layout (obviously because I live in Sweden, and have swedish key-caps). The command is KEYB SV (except for directory names), and i use MSDOS 3.30. I've also tried the UK layout. It had the same problem. The US layout on the other hand, works fine, and it doesn't matter how I get to it. I can switch to it by hitting CTRL-ALT-F1, or load it with the command KEYB US, och just not load the swedish layout. > Casper H.S. Dik > University of Amsterdam | dik@uva.uucp > The Netherlands | ...!uunet!mcvax!uva!dik I suspect that most of the readers on this net, work in the US, and would not have experienced this problem. I notice that dik@uva.uucp is writing from the Netherlands. Does anyone know why KEYB has this undesirable effect? I still think that not even all users that do use KEYB have this problem. Why? Are they just fortunate enough to have a 16550 on their serial port? (That is not likely, I think.) -- Kristoffer Eriksson, Peridot Konsult AB, Hagagatan 6, S-703 40 Oerebro, Sweden Phone: +46 19-13 03 60 ! e-mail: ske@pkmab.se Fax: +46 19-11 51 03 ! or ...{uunet,mcvax}!enea!kullmar!pkmab!ske