Subject: Re: Q:  IIGS-image transfer using ADT?
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From: Rubywand <rubywand@swbell.net>
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Deacon Blue writes ...
> 
> Hi!
> 
> I'm using ADT 1.22 for transfer of dos-order DSK-images to floppies. 
> My setup is an Apple IIC with a null-modem cable to PC.
> 
> My question is:
> 
> Is it possible to hook up a secondary 3.5" drive to the IIC and make
> transfers of GS-disk images (IMG)  using ADT 1.22 on the IIC, or will
> these transfers have to be done from  the IIGS?
> 
 ....

     ADT (every version) is dedicated to direct transfer of standard 5.25"
.dsk disk image files:

.dsk file--> 5.25" diskette or
5.25" diskette--> .dsk file.


     The way to move 3.5" 2MG images as well as any ShrinkIt .shk or .sdk
file is via a standard telecom file transfer over a NULL modem connection.
For example, with Modem MGR running on the //c or IIgs and Hyperterm running
on the PC, you would do a Z-modem file transfer.

     A standard 3.5" 800k diskette is plenty big enough to hold a ShrinkIt
compressed 3.5" whole-disk archive (a 3.5" .sdk file). The fact that the disk
content may be IIgs files, some of which may have resource forks, does not
matter. Whether running on a IIgs or //c, 8-bit ShrinkIt can uncompress the
file to another 3.5" disk because, for a whole-disk archive, it is dealing
with Blocks, not files.

     ShrinkIt archives of files (.shk files) are different. They can be small
enough to fit on a 5.25" diskette with no problem or so large that they will
not fit on a 3.5" diskette. An .shk archive of IIgs files will not unshrink
correctly using 8-bit ShrinkIt if any of the files have resource forks.

     For .2MG 3.5" disk image files, you, again, have a disk archive (so file
content is not a problem).  The snag you run into is that the file is too
large to fit on a 3.5" 800k diskette. A way around this barrier is to use
WinZIP to compress the file on PC and transfer the .zip file. (.2MG images
are frequently already in .zip form when downloaded; so, the compression step
is usually not necessary.)

     Since, one way or another, you need more than an 800k 3.5" diskette to
hold the uncompressed .2MG file, unzipping will probably need to be handled
on a IIgs. PMPunZIP is a good utility to use. The target can be a hard disk,
Zip Drive disk, or large RAM disk. Once you have the .2MG file, NinjaForce's
Asimov2 can convert it to 3.5" diskette.



Rubywand