Re: macADT and .dsk images over 140k

["William Garber" <willy46pa@garberstreet.com>]

<touchstone> wrote in message 2007120902343675249-@netnews.comcast.net">news:2007120902343675249-@netnews.comcast.net...
: 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.


You'll most likely find that they've all got attached header
or trailing bytes, or both. Otherwise the images are fine.
The same thing happens to images on my FTP site when folks
attempt to upload directly to download folders, rather than
to my specified upload folder.

William Garber
Email Address - willy46pa@garberstreet.com
Alt. Email - willy46pa@comcast.net
Web address - http://www.garberstreet.com