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000106_news@newsmaster….columbia.edu _Thu Jan 7 13:21:22 1999.msg
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From: Timothy Martin <tjmartin@anl.gov>
Newsgroups: comp.os.os9,comp.protocols.kermit.misc,news.groups.os.os9
Subject: Re: Skewed image data when transferred with Kermit
Date: Thu, 07 Jan 1999 12:12:39 -0600
Organization: Argonne National Laboratory
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Brian Reid wrote:
>
> I am trying to use kermit95 to transfer 8 bit row ordered SEM image data
> from a Tracor Northern 8502 image analysis system (running OS-9) to a PC
> (running Windows98) using a serial connection. The files appear to transfer
> successfully, however, the image features are skewed when viewed using NIH
> image. For example, a square feature would appear as a parallelogram with
> the bottom side moved to the right. When I try to send the file back to the
> OS9 system, the TN8502 software indicates that the image bin is too small to
> hold the image data.
>
> Is there any possibility that Kermit is adding bits somewhere in the binary
> file? Could the file be getting corrupted somehow in the transfer?
>
> Thanks in advance for any suggestions.
>
> Brian Reid
> Doctor of Chemistry Program
> University of Texas at Dallas
> breid@utdallas.edu
> (972)-883-2709
I read the Frank da Cruz replies. Questioning a proper binary transfer
is certainly in order. You should check that the files on the OS-9
and Win98 sides are identical. You can do this with a utility such
as "md5". I have OS-9 and DOS executables for md5. If you haven't
heard of md5, it generates a "hash code" which is a number generated
based on the contents of the file. If md5 produces the same hash code
on the OS-9 and Win98 versions of the file, you can be essentially
guaranteed that the files are identical.
If you want this sort of verification and can't find "md5" for DOS or
OS-9, tell me. Of course, you could transfer the file there and back
and see if it is unmangled also. Do an OS-9 "cmp" to compare two files.
EOT.