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000473_news@columbia.edu _Mon Mar 24 14:54:27 1997.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Problems with Tecra+DOS+kermit
Message-ID: <1997Mar24.082701.95829@cc.usu.edu>
Date: 24 Mar 97 08:27:01 MDT
References: <5guvjb$9bu$1@argon.csl.sri.com>
Organization: Utah State University
Lines: 45
Xref: news.columbia.edu comp.protocols.kermit.misc:6805
In article <5guvjb$9bu$1@argon.csl.sri.com>, rushby@news.csl.sri.com (John Rushby) writes:
> Recap: Kermit 3.14 is unable to drive the built-in modem of my Tecra
> 740 above 2400 baud. I've since found that it works ok at 4800, but
> definitely locks up at anything faster.
>
> In article <1997Mar20.194638.95771@cc.usu.edu>,
> Joe Doupnik <jrd@cc.usu.edu> provided some helpful suggestions and wrote
>>
>> I presume, being laptop-less in Logan (UT), that the Toshiba is
>>a distinguished member of the laptop tribe.
>
> The Tecra 740 is Toshiba's top-of-the-line laptop. It's the size and
> weight of the San Francisco phone book, and gets hot enough to fry
> eggs. It's also faster than the Sparc 20 in my office. I think the
> speed may be a significant factor.
>
> Joe's suggestions focussed on the modem, but that doesn't explain why
> I get the same behavior with an external modem on a regular com port,
> nor why Kermit 2.29 works fine with the same modem.
>
> I've since done some further experiments using a Toshiba Portege 660
> (150 MHz Pentium). This produces identical behavior to the 740:
> Kermit 2.29 works fine, 3.14 locks up above 4800 baud.
>
> The 660 has Linux, so I tried C-Kermit and that also worked perfectly.
>
> My speculation: these machines are *very* fast; I also remember
> reading somewhere that the highly integrated chipsets of these laptops
> run the UART (which is the FIFO variety) at full bus speed. So maybe
> the lean-and-mean 2.29 and the moderately trim C-kermit can keep up
> whereas 3.14 cannot.
>
> Is this plausible? Can anything be done?
>
> John
-----------
I don't know why this message was reposted to NEWS when the matter
was discussed and solved in direct communications some days ago.
For those interested, the serial port in the above fancy Toshiba
machines is broken. It cannot perform in FIFO mode. Bad news, owners. This
has nothing to do with cpu speed and all that jazz, and MSK 3.15 is loafing
at serial port speeds. MSK 3.15 beta 19 will have an additional phrase to the
SET COM1 command to turn off use of FIFO, and John already verified that the
solution works fine on those broken machines.
Joe D.