Re: I just did something unbelievably stupid...

[guertinp@IRO.UMontreal.CA (Paul Guertin)]

In article <2lrkga$8bb@charm.magnus.acs.ohio-state.edu> valthoff@magnus.acs.ohio-state.edu (Victoria M Althoff) writes:
>Euphoric that my SSC is working again, I set about transferring a data file 
>from the Lisa to the ][e, so that I can get a cleaned-up version u/l'ed to the 
>net.  Well, the first couple of attempts failed, but I finally got it right.

[story deleted]

>I do have a sector editor that is capable of reading and writing ProDOS disks 
>(albeit in half-block segments).  So what I need to know is:
>
>WHAT CHANGES WHEN A PRODOS FILE IS DELETED?
>and, most important...
>WHAT DO I FIX TO MAKE A FILE REAPPEAR IN THE DIRECTORY?

Do you remember the version number of the ProDOS that was active when
you deleted the files? According to Sandy Mossberg in Nibble vol 7 no 11,
"ProDOS 1.2 and its forebears irrevocably mangled files in the process
of deleting them. ProDOS 1.3 and its progeny preserve the integrity of
deleted files."

In the same article, Sandy disassembles and documents the ProDOS code
that performs the deletion. I think there's enough information in there
to allow you to manually undelete your files. But the article is 8 pages
long, and I don't have the time to type it in or summarize it. If you 
email me your street address, I'll mail you a photocopy.

There are programs that can undelete ProDOS files automatically, such
as Copy II Plus 6 and higher (Versions up to 5 supported DOS 3.2 and 3.3,
and later versions support DOS 3.3 and ProDOS). If you're going to
transfer many files from ProDOS to DOS 3.3, I recommend getting Copy II
Plus, it makes working with ProDOS on 140k disks almost bearable.
Almost.

>--Dave Althoff, Jr.

Paul Guertin
guertinp@iro.umontreal.ca