('changes', from 'unzip64.sfx-v1.01')

There are few minor changes from the first release of unzip64.

There was an error in the shrinking decompression. It only occurred
when there was two consecutive zeros in the file. It doesn't affect most
people as this is not a problem when dissolving text files, it did cause
problems for those using QWKie.

If the file was compressed with anything other than implode,reduce,shrink or
store, unzip64 would correctly say that it could not decompress but by then it
would already have opened the file and it would not have been closed, thereby
creating a splat file.

The first release only produced program files. A menu option has been provided
to allow for the production of sequential files, again this was for QWKie users.

 ('unzip.doc', from 'unzip64.sfx-v1.01')

               Unzip 64
               --------
        @1993 By Bill Lucier

This program is free to be distributed
as long as it is complete and
unmodified.

Unzip64 will dissolve pkzip 1.10 files
on the commodore 64. If you attempt to
dissolve a file that was deflated it
will just skip over it.

The Main Menu:
--------------
To make this program as easy to use as
possible, I have limited the number of
choices that have to be made.
The main menu will allow you to select
an input drive,an output drive,fast or
slow mode and whether or not you wish to
check the file for errors
(crc checking),unzip a file a file or
to exit.

Valid drive numbers are between 8-30.
For this version, different partitions
and different subdirectories on CMD
devices are not supported. You will
have to be in the proper partition
and subdirectory for Unzip64 to work.

On C128s, selecting fast mode will
kick the processor into 2Mhz. On a 64
it will blank the screen and increase
processing speed by about 7%.

I have given the option of turning off
crc checking because by and large this
program will just be for the use of
extracting text files, I think that
no harm will come if there is an error
in the file. For this reason I have
also left the files on disk if there
is an crc error in the file. At least
part of the file may be salvageable.

UnZipping a File:
-----------------
On Selecting option 5, the directory
will be read in from the input drive.
Unfortunately due to memory constraints
every time you choose option 5 the
directory will be read into memory,
even if the same disk is in the drive.
The zip files on disk will appear
in a small popup in the middle of the
screen. You may cursor up and down this
popup if there are more then 14 zipped
files on disk you have to go to the
bottom of the popup and as you precede
downward the rest of the zipped files
will scroll onto the bottom of the
popup. Press return on the file you
wish to unzip.

As the header for each compressed file
in the archive is found a line will be
printed out after the file name.
The line will read: Yes/No/Quit/All
The first letter in each word will be
reversed. This is the letter to press
if you wish to take that action.
If you want to extract the file press Y,
if you do not want to extract the file
press N. If you have extracted all the
files that you need to press Q to quit.
Pressing A will extract the rest of
the files in the archive.

Files that already exist on disk:
---------------------------------
If you choose to dissolve a file that
already exists on disk you will be
prompted with:
File Exists: Replace/Skip
If you choose to replace the file
the one on disk will be erased and
the new file will be written on disk.

This program took roughly six-seven
months to write. Writing it was
actually an education in itself.
This is a shareware program. Payment
is what ever this program is worth to
you. Any one who sends in $5 will
recieve the next upgrade and hopefully
a zip package. I realize that as this
program is, a great many people will
not need it as they may not want to get
at ibm/amiga files. I am looking into
writing a pkzip program for the 64/128.
It would be helpful to know what kind
of equipment the people that would use
this program have. For example 64 or
128,reu,ramlink or ramdrive. For owners
of ramlinks or ramdrives to you have a
dacc? If not would you be willing to
create one and if you would how large
would you make it?
I *think* that a pkzip program could be
done on a 128 as is, but having
an reu could not hurt. The memory
situation on the 64 is quite a bit
tighter. I may have to write a shell
program that will bring in the seperate
parts of the program as they are needed.
Any comments about this would be
greatly appreciated.
Also I would welcome comments,
constructive criticism or any other
thoughts with regard to unzip. Of
course I would like to be notified of
any bugs. If at all possible it would
be helpful to have a copy of the file
it bombed on. Also what equipment is
being used on your setup.
Currently I can be reached on Genie as
B.lucier1. If you do not have access to
Genie, I don't have access to netmail
on Fido but if you don't mind making
your message public, I will answer all
questions directed to me on Fido.

For those who do not have access to
either of these two, you can write to
me. My address is:

Bill Lucier
10440 67th ave
Edmonton Alberta
Canada
T6H-4Y2

Also I would like to thank my beta
testers for finding all the errors that
they did and for their many helpful
suggestions.