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000179_news@newsmaster….columbia.edu _Wed Jun 3 13:02:41 1998.msg
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From: jaltman@watsun.cc.columbia.edu (Jeffrey Altman)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: K95 Transposing Keystrokes
Date: 3 Jun 1998 17:02:36 GMT
Organization: Columbia University
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References: <01bd8f00$b0c1ba20$cc691a93@shc204.health.swt.edu> <6l3sud$93l$1@samba.rahul.net>
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In article <6l3sud$93l$1@samba.rahul.net>, <dold@network.rahul.net> wrote:
: Heath D. Marr (hm04@a1.swt.edu) wrote:
: : Several of my users are reporting that numbers/letters are being transposed
: : while using Kermit95 (1.16) for terminal emulation. I was skeptical and
: : tried it out. Sure enough - the typed characters are scrambled when typed.
: : It is intermittent and seems to occur only when typing at a relatively
: : quick rate. It's very frustrating and I'm not sure what will solve the
: : problem. I am 99% certain its not hardware.
:
: I have the same problem, and have had with all versions of K95.
: This occurs on serial connections as well as PPP connections.
: The transposed characters are not necessarily just a one-for-one swap; I do
: that with my own left to right coordination when pecking rapidly. I have
: seen blocks of three characters displaced by a few spaces, possibly three.
: The problem has stayed with me through an upgrade from 75MHz to 133MHz.
:
Lets take this off the newsgroup and get it into e-mail where the
round-trip time is shorter. This is beginning to sound like it might
be different then the bug we documented in Windows 95.
Just as a review, the documented bug occurs when Windows 95 is being
blocked and CONAGENT in unable to process the key events which are
being delivered to it by the Window in which it is executing. The
Window stores the key events in a queue but treats it LIFO (as a
stack) instead of FIFO. When CONAGENT attempts to process the data
the queued events are received in the wrong order.
Therefore, it is possible for the user to type
abcdefghij
but have k95 receive the characters as
abcgfedhij
depending upon when Windows 95 became blocked. The blocking behavior
is due it its 16-bit DOS/Win 3.x heritage and is very well documented
in Andrew Schulman's "Unauthorized Windows 95". Windows 95 still has
a large amount of 16-bit code which is not safe to be multitasked.
Whenever this code is accessed all multitasking must be blocked. This
causes delays in the delivery of keyboard events. This blocking may
be caused by:
. the use of a 16-bit Windows application;
. the creation or deletion of a process
. the execution of a 16-bit device driver (networking, file i/o,
memory management, ...)
If the problem you are seeing is not exactly as it is described above
please send e-mail to kermit-support@columbia.edu so that we can track
it down further.
Jeffrey Altman * Sr.Software Designer * Kermit-95 for Win32 and OS/2
The Kermit Project * Columbia University
612 West 115th St #716 * New York, NY * 10025
http://www.kermit-project.org/k95.html * kermit-support@kermit-project.org