[Coco] Princeton files
John E. Malmberg
wb8tyw at qsl.net
Sun Oct 12 00:58:00 EDT 2003
Bob Devries wrote:
> I'll be working towards putting all this stuff onto CDROM.
> Any ideas on how I should go about this would be welcome.
> Two important issues occur to me:
> 1. filename lengths
That is easy. ISO9660 restricts filenames to 8 characters with a 3
letter extension. It also restricts them to 8 directory levels.
There have been many extensions to the standard, but the above is what
you can expect any platform to be able to read.
> 2. attributes.
ISO9660 supports many file attributes. Unfortunately since most
operating systems do not, most of the mastering software I am aware of
will not allow you to set them.
> My idea is to create a directory on the HD of my COCO3, and put everything
> in there in the same way as on my PC HD, and then do a "ls -lR >index.txt".
> That will at least give an idea of what the directory structure looked like
What would probably be good enough is to put the directory tree created
by each "disk" in a ZIP archive and put the resulting archives on an
> Ideally, of course, it would be great to make an OS-9 file system CDROM, but
> (a) I don't have any idea of how to do that, and (b) I don't have a CDROM
> drive on my coco3 nor my MM/1 to read it.
The ISO file system starts at 64 * 512 bytes. While you can build an
dual format ISO volume that only has one copy of each file that both
directory trees are linked to, the mkisofs program seems to only support
The procedure is to first put all the files in a staging directory on
the system you are creating an ISO master on, and then create the ISO image.
Then you create a logical disk container file the size of the CD-ROM
that you will be burning.
You overlay the ISO master over the container file, and reset the EOF
marker on the container file to be where it is supposed to be.
Then you use a program to initialize the container file as an OS-9 (or
other) volume, but mark the sectors starting at 64 * 512 bytes through
the size of the ISO image as bad, so the intializer will not touch them.
[Other ways probably can be done for this]
Keep in mind that CD-ROMS are blocked at 2048 byte sectors, so all files
are a multiple of that size. That can limit the amount of files.
Now that is how to make a dual format volume. How to get the COCO to
read it in either format is a different story.
wb8tyw at qsl.net
Personal Opinion Only
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