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- From: ts@chyde.uwasa.fi (Timo Salmi)
- Subject: pkz204e.exe - pkzip/unzip 2.04e uploaded to garbo
- Message-ID: <ts9301271411.1266@chyde.uwasa.fi>
- Followup-To: comp.compression
- Sender: ts@uwasa.fi (Timo Salmi)
- Organization: University of Vaasa
- Date: Wed, 27 Jan 1993 14:11:47 GMT
- Approved: ts@chyde.uwasa.fi
- Lines: 209
-
- -Subject: Re: pkz204e.exe - pkzip/unzip 2.04e uploaded to garbo
- -To: kko@sfu.ca
- -Date: Wed, 27 Jan 1993 16:11:02 +0200 (EET)
- -From: ts
-
- > Hi, I've just got pkz204e.exe from PKWARE BBS and uploaded it to
- > /pc/incoming at garbo ...
-
- Thank you for your contribution Samuel. This upload is now
- available as
- 196424 Jan 25 02:04 garbo.uwasa.fi:/pc/arcers/pkz204e.exe
-
- > >From the file v204e.new ...
- >
- > The following changes have been made in version 2.04e of
- > PKZIP/PKUNZIP from version 2.04c.
- >
- > 1) DPMI.
- >
- > The DPMI support in PKZIP/PKUNZIP has been changed to work
- > around bugs and anomolies with the following DPMI drivers or
- > environments. PKWARE would like to thank Quarterdeck Office
- > Systems and Qualitas, Inc. for their technical assistance
- > regarding DPMI.
- >
- > a) PC-KWIK
- >
- > According to PC-KWIK corporation's document, 'PC-KWIK
- > Technical Issues "Summer '92"':
- >
- > PC-KWIK is unable to recognize memory requests from programs
- > using VCPI or DPMI protocols ... For programs [that use VCPI
- > or DPMI] it is necessary to reduce the size of the cache and
- > disable lending.
- >
- > PC-KWIK has a lending feature that allows memory to loaned
- > from the cache memory to applications. However, PC-KWIK is
- > not aware of any memory allocated or used by DPMI, and will
- > loan this memory as well, possibly causing corruption of the
- > DPMI driver and usually resulting in a system crash or reboot.
- >
- > This problem seems to present in most versions of SUPERPCK,
- > through version 5.01.
- >
- > In other words, when using PC-KWIK with any program that uses DPMI,
- > including PKZIP and PKUNZIP, you should either make sure that you
- > have enough memory in your computer so that lending will not occur,
- > reduce the size of your cache, or disable PC-KWIK's lending.
- >
- > Therefore, PKZIP/PKUNZIP detect for the presence of PC-KWIK
- > and default DPMI to DISABLE when PC-KWIK is installed. This
- > can be overidden by specifying -)+ on the PKZIP or PKUNZIP
- > command line, or by placing DPMI=ENABLE in your PKZIP.CFG for
- > PKZIP or setting the environment variable PKUNZIP=-)+ for PKUNZIP.
- >
- > b) QDPMI 1.00
- >
- > If a program tries to use DPMI and EMS memory with QDPMI 1.00,
- > QDPMI would become unstable or crash. PKZIP/PKUNZIP now
- > check for the presence of QDPMI 1.00 and if PKZIP/PKUNZIP
- > are using EMS memory, they do not attempt to use DPMI at all.
- >
- > c) QDPMI 1.01
- >
- > When a program switches to protected mode, QDPMI does not
- > 'synchronize' the EMS page frame. The result is that programs
- > can not correctly read or write any data in the EMS page frame
- > while in proteced mode. PKZIP/PKUNZIP now check for the presence
- > of QDPMI 1.01 and will use slower real-mode code for any
- > manipulation of data in the EMS page frame rather than faster
- > protected mode code.
- >
- > d) OS/2 2.0 DOS BOX
- >
- > The OS/2 2.0 DOS box does not allow programs to allocate the
- > 'DPMI private data area' in an UMB. Doing so causes a system
- > violation error. PKZIP/PKUNZIP now check to see if they are
- > running in the OS/2 2.0 DOS box and will not allocate the DPMI
- > private data area in an UMB. (This is actually kind of a shame,
- > as the OS/2 DOS box (unlike the Windows DOS box) provides UMB
- > memory to DOS applications. It should be able to allow programs
- > to store the DPMI data area in these UMB's.)
- >
- > e) Windows 3.0 DOS BOX
- >
- > The DPMI support in the Windows 3.0 DOS box does not always
- > seem to work correctly. Therefore, PKZIP/PKUNZIP detect if
- > they are running in the Windows 3.0 DOS box and will not support
- > DPMI in this environment.
- >
- > f) Windows 3.1 DOS BOX
- >
- > The way PKZIP/PKUNZIP allocates the DPMI save/restore state
- > buffer has been changed to be more compatible with Windows 3.1.
- >
- > 2) The Norton AntiVirus program FALSELY reported that PKZIPFIX and
- > PKUNZIP contained the Maltese Ameoba virus. The software DID
- > NOT contain this virus. All files in this release have been
- > modified so as to not trigger any FALSE virus reports by the
- > Norton AntiVirus program.
- >
- > 3) QEMM versions 5.1x would corrupt the high word of the 32-bit
- > registers on an 80386 or 80486 CPU. PKZIP/PKUNZIP check for
- > this condition, and will not use 32-bit instructions if QEMM
- > version 5.1x is present.
- >
- > 4) Apparently some peer-to-peer networks such as Novell Netware Lite
- > and others do not support canonical or fully specified filename.
- > PKZIP now uses noncanonical filenames when specifying temporary
- > filenames on a network drive to avoid this problem.
- >
- > 5) PKZIP would erroneously report "E28 Destination is same as temp
- > directory" when creating a new .zip file on drive A:. This has
- > been fixed.
- >
- > 6) The keywords on/enable and off/disable are now synonymous when
- > used in the PKZIP configuration file.
- >
- > 7) Using EMS= options in the PKZIP configuration file would enable
- > or disable both EMS and XMS usage. The XMS= option had no effect.
- > This has been corrected.
- >
- > 8) The Quick format option in PKZIP would zero out the existing FAT
- > on the disk (by design). However, if the disk had any bad
- > sectors on it (in which case, it isn't a good idea to use that
- > disk as a backup disk anyway...) they would now be marked as
- > good. By popular demand, PKZIP now reads the existing FAT and
- > leaves any bad sectors marked as bad. This however, makes the
- > 'Quick' format function about twice as slow as it was (although
- > still much faster than an unconditional format). In most cases
- > however, unless there are several subdirectories on the diskette,
- > the -&w (wipe) option is faster than the -&f (format) option when
- > backing up to pre-formatted diskettes.
- >
- > 9) Under some cirumstances, PKZIP could possibly store the last
- > file in a multi-disk backup set incorrectly. This has been
- > corrected.
- >
- > 10) The volume label option in PKZIP would not work. This has been
- > fixed.
- >
- > 11) PKZIP/PKUNZIP now searches for a PKNOFASTCHAR variable in the
- > DOS environment. If this variable is present, PKZIP/PKUNZIP
- > will use the slower DOS 1.x/2.x character output functions
- > rather than the 'DOS Fast Character Output' function. This is
- > provided for compatability with some TSR's, BBS Doors and mail
- > readers etc., that redirect or capture the output of programs and
- > do not support the DOS Fast Character Output function.
- >
- > 12) PKZIP will now accept either MAXIMUM or MAXIMAL in the
- > configuration file.
- >
- > 13) Some people have requested that the -& backup option support the
- > DOS verify function. Specifying -&v on the PKZIP command line
- > or BACKUP=VERIFY in the PKZIP.CFG file will turn on the DOS
- > verify flag when writing to the backup disk(s). This makes
- > PKZIP run slower, but ensures better integrity of each diskette.
- >
- > 14) Using the -m option with -rp in PKZIP will delete any empty
- > subdirectories that have been saved in the .ZIP file after all
- > the files have been moved into the .ZIP file. Some people have
- > requested a way to have PKZIP leave these empty subdirectories
- > behind. This can be accomplished by using -m- on the PKZIP
- > command line.
- >
- > 15) It appears that some versions of NoGate's PAK program would
- > place incorrect information in the .ZIP file directories that it
- > created. Specifically, the disk number information for where
- > files, the central directory, and the central end directory
- > started is inconsistent, causing PKUNZIP to think it was
- > extracting a multi-disk .ZIP file when it really wasn't.
- > PKUNZIP now checks for this condition, and ignores this
- > erroneous information.
- >
- > 16) PKZIP now ignores any ZIPDATE= or -o or -k options when creating
- > multi-disk .ZIP files, rather than displaying the help screens.
- >
- > 17) On some 80386 machines running PKZIP could leave allocated UMB's
- > behind. This has been corrected.
- >
- > 18) In some circumstances, running PKZIP with EMS memory and very low
- > free conventional memory could cause corruption of the .ZIP file.
- > This has been corrected.
- >
- > 19) When PKZIP prompts for an encryption password, it will now ask the
- > user to enter the password twice for verification.
- >
- > 20) PKZIP/PKUNZIP would not work under DOS 2.x. This is because
- > DOS 2.x crashes on many int 2Fh installation check calls for
- > EMS/XMS drivers etc. These calls work properly under DOS 3.0
- > or above. Therefore, PKZIP/PKUNZIP detect for the presence
- > of DOS 2.x, and will not support any of the advanced features
- > including 32-bit instructions, EMS memory, XMS memory, DPMI
- > support and Netware usage.
- >
- > 21) PKSFX could in some instances erroneously report failed AV's or
- > garble any AVEXTRA text present. This has been fixed.
- >
- > 22) Using PKZIP with the -o option or ZIPDATE=LATEST in the configuration
- > file would set the date of the .ZIP file to the latest dated file
- > or directory. Directory dates are now ignored in this version.
-
- All the best, Timo
-
- ..................................................................
- Prof. Timo Salmi Co-moderator of comp.archives.msdos.announce
- Moderating at garbo.uwasa.fi anonymous FTP archives 128.214.87.1
- Faculty of Accounting & Industrial Management; University of Vaasa
- Internet: ts@uwasa.fi Bitnet: salmi@finfun ; SF-65101, Finland
-