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READ.ME
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s3uz150l.zip
This archive contains an EPOC binary for version 1.50 of Unzip
for Psion Series 3, 3a, HC, MC400 and Workabout machines, plus
some documentation.
This port is based on the Samuel H. Smith / Info-ZIP team source
code, the home FTP site for which is ftp.uu.net:/pub/archiving/
The home FTP site for the EPOC port is:
sunsite.doc.ic.ac.uk
/computing/systems/handhelds/psion/icdoc/utils/
where the current version is in files s3uzip15s.zip and
s3uzip15l.zip - being the small and large variants, respectively
(see below). Note that these filenames differ from the canonical
ones listed below, due to the naming conventions for automatic
update used at Imperial College. If downloading for further
distribution, please rename the archives to s3uz150s.zip and
s3uz150l.zip respectively, to conform with 8.3 format.
Version 1.50 incorporates some minor enhancements to the screen
output, to better suit the wider 3a screen. A side-effect of
these changes is that the output mis-displays under the
DOS-hosted Series 3 emulator. This is a known problem with the
emulator, and there is nothing to be done about it - without
restricting 3a users to a 40-column output window.
Version 1.50 is available in two variants:
1.50s -- the small variant, which handles version 2.x zip
archives only;
1.50l -- the large variant, which handles all zip archive
versions, including the now obsolete version 1.x type.
The variant is indicated by a suffix letter in the name of the
distribution zip file, after the version number:-
s3uzNNNs.zip contains the small variant;
s3uzNNNl.zip contains the large variant.
The small variant is intended for use on a Series 3 classic,
where memory is at a premium. The large variant is best used
on machines with at least 512K.
Version 1.41 incorporated a workaround for a bug in Pkzip-made
archives, whereby the Huffman distance tree may be incomplete in
some circumstances. The program will note this by displaying
'(incomplete d-tree)' after the file name, when extracting or
testing an archive. Archives created with the generic version of
Zip do not exhibit this problem.
Version 1.4 adds support for external applications that invoke
UNZIP.IMG, specifying the destination directory to which files
are to be extracted. See the enclosed file APPNOTES.TXT for more
information.
Version 1.3 added support for unzipping from remote files across
the serial link. This did not work in prior versions due to the
failure of the CLIB stat() function across filesystems. See below
for an example of remote unzipping.
UnZip requires considerable free memory to run, so its not
suitable for unzipping other than small files to the internal
drive.
To use interactively on Series 3/3a machines, you need version
1.1 of RUN.APP (included in this archive) as the front-end for
the UNZIP.IMG file, or a similar shell.
See the enclosed file RUN.DOC for brief notes on installing and
using the RUN utility. Quick quide: create a \RUN directory and
copy UNZIP.IMG there; copy RUN.APP into an \APP directory, and
install it on the system screen by keying Psion-I.
Here are some examples of the use of the 'Initial path' parameter
with UnZip:
Command line: -l a:\transfer\myzip
Initial path:
Command line: -l myzip
Initial path: a:\transfer
Where only a listing of the archive contents is requested, the
two forms above are identical. Where an archive extraction is
specified however, the 'Initial path' parameter specifies the
directory to which the files archived should be extracted. For
example:
Command line: a:\transfer\myzip
Initial path: b:\
will cause the files in MYZIP.ZIP in the specified directory to
be extracted to the root directory of drive B. Note that the full
path name of the archive must be specified on the command line.
As of version 1.3, remote files can be unzipped using Unzip and
Mclink or Slink. If Slink is used, it must be version 1.2 or
later.
Command line: rem::f:\download\newstuff
Initial path: a:\
will extract the remote zipfile on the PC to the SSD in drive A
on the S3. This is the fastest way to move bulk data from PC to
S3.
-------------
David Palmer
Edinburgh
Scotland
June, 1996