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Re: macADT and .dsk images over 140k



On 2007-12-09 00:38:20 -0700, "Michael J. Mahon" <mjmahon@aol.com> said:

touchstone wrote:
hi,

i have an apple iie connected to a g3 all-in-one (remember those) running os 9.1. it works flawlessly with images of exactly 143360 bytes, as you would expect. i've been downloading the images from asimov.net and some of them that i would like to try expand to 144k or 143363 or thereabouts. of course, adt on the iie won't accept any extra
bytes over the capacity of a floppy.


any ideas?  i've set the type and creator correctly and it's not a custom icon.
i tried to copy/edit these images on a iie emulator using blank 140k images, to no avail, using
an app called 'iie' found on the asmiov archive.

My guess is that a "prefix" has been added to the files.

If you have a hex editor, you could write the file back to disk
without these extra bytes.  Comparison with a known-good image
with the same operating system (e.g., DOS or ProDOS) should reveal
where the image actually starts.

As you've found, some of the files on Asimov are not quite as
advertised...

-michael

NadaPong: Network game demo for Apple II computers!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it's seriously underused."

THAT is a great idea!

wouldn't you know the first one i looked at (3 bytes too long) seemed to just have some extra 00's. no, wrong, big time. i compared two hex dumps side by side and it seemed obvious enough, they were both 3.3 images. looks like i'll have to go through each 256 byte chuck -560 in all- to figure it
out.

thanks for the input.  i'll continue along these lines.

matthew