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000368_news@columbia.edu_Fri Jul 14 15:29:56 1995.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.os.os2.networking.tcp-ip,comp.protocols.kermit.misc
Subject: Re: MS-KERMIT 3.14 and WARP CONNECT
Message-Id: <1995Jul14.212957.56249@cc.usu.edu>
Date: 14 Jul 95 21:29:56 MDT
References: <3tu54l$jf6@news.iastate.edu> <3tunpq$ou5@apakabar.cc.columbia.edu> <3u1n7b$4qr@news.iastate.edu> <1995Jul12.211420.56017@cc.usu.edu>
Organization: Utah State University
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In article <1995Jul12.211420.56017@cc.usu.edu>, jrd@cc.usu.edu (Joe Doupnik) writes:
> In article <3u1n7b$4qr@news.iastate.edu>, zollner@iastate.edu writes:
>> In <3tunpq$ou5@apakabar.cc.columbia.edu>, fdc@watsun.cc.columbia.edu (Frank da Cruz) writes:
>>>Tek emulation will come to C-Kermit eventually.
>> I have been waiting for almost 10 years to throw out the serial cables to
>> my VAX. I would rather have a solution now than wait for eventually to
>> happen. Besides, who knows how the Tek emulation will work in C-Kermit.
>> Since there is no standard for switching between graphics and text,
>> MS-KERMIT may behave differently than C-KERMIT. For both reasons, I would
>> like to get MS-KERMIT working with IBM TCP/IP.
>>
>>>>4) Can I run MSKERMIT using the INT 14h interceptor included in the
>>>> IBM TCP/IP 2.0 DOS access kit together with the TCP/IP 2.0 base for OS/2
>>>> and OS/2 2.1.
>>>Maybe. Give it a try.
>>
>> OK. So I tried. Thanks to the guy who told me how. (It is not documented in
>> WARP CONNECT):
>>
>> The INT 14h interceptor included in WARP and WARP CONNECT is called
>> COMTCP.EXE and is located in the TCPIP/DOS/BIN directory. When I try to use
>> it by typing
>> COMTCP host kermit.exe
>> with KERMIT set to (SET PORT BIOS1), then I get an exception in my DOS box.
>> I have to close the DOS box. I tried a variety of different things, but
>> without success. The location changes. The register contents are not
>> reproducible. (If they were, I could post them here.)
>>
>> Reportedly, this functionality was working with MS-KERMIT 3.13 (more or
>> less) and was broken with MS-KERMIT 3.14. I also heard that I am not
>> supposed to use (or obtain) MS-KERMIT 3.13 anymore.
>>
>> Question: Is this something that can be fixed by changing KERMIT or does
>> it require changes in the TCP/IP code from Raleigh.
------------------
This is a summary report on the above difficulty using MS-DOS Kermit
v3.14 over OS/2 program COMTCP.
The difficulty has been identified by the sharp eyes of Bob Babcock:
COMTCP goes belly up if the COM port number in register DX has bits set in
the high order byte (reg DH). The IBM PC Bios Int 14h services use only
register DL, the lower byte, and ignore the high byte. Apparently COMTCP
does not check the value, uses DH plus DL, and crashes if DH != 0 (and
perhaps if DX > 4, but that's not been checked).
MSK v3.14 clears reg DH in all places but one, and this has never
been a problem until now. Adding a clearing operation lets the two programs
work together, according to tests by Jeff Altman and Bob Babcock. Thanks
to both gentlemen for quick testing.
It seems that COMTCP needs adjustment to ignore DH and range check
DL, just as the IBM PC Bios Int 14h services do.
This weekend I will see if I can create a new Patch for MSK 3.14
to add the clearing operation. We will announce the patch when it's ready.
Joe D.