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From: sdh@joevax.UUCP (The Doctor)
Newsgroups: net.micro.apple
Subject: Re: uncatalogable files
Message-ID: <312@joevax.UUCP>
Date: Fri, 10-Oct-86 14:46:20 EDT
Article-I.D.: joevax.312
Posted: Fri Oct 10 14:46:20 1986
Date-Received: Sat, 11-Oct-86 20:48:12 EDT
References: <8610091954.AA15615@ucbvax.Berkeley.EDU>
Organization: Bell Communications Research Inc., Morristown, NJ
Lines: 40

> Does anyone know how to find out the names of files that do not
> show up when you type in CATALOG.  I know they are on the disk.
> How do you go about accessing them?
>

There are two types of files:
1) files that are part of the normal catalog, but have control characters
embedded in them to prevent you from seeing them, for example,
*B 005 FILEhhhhhhhhhhh
where h stands for backspace will show thw filename as a blank.
To see the file, just type
SPEED = 0
at the applesoft prompt, and it will slow the output down so you can see
the file name and then see it erased.  You will not be able to see other
control characters, though.
Solution 2:
There is a program in the original DOS 3.2 manual (it may be in the
3.3 manual too) that is an assembly language subroutine that intercepts
the output and changes control characters to inverse.  This works like
a dream.
Solution 3:  Use a disk scanning program to view the catalog (traditionally
on track $11) and it should be able to show you all the control characters.
You should then be able to change them to printing characters.
NOTE: if you change the finle name, you may have to change it back or
things might not work at all.

2) the second kind of invisible file has no entry in the catalog.  It
exists on the disk as a normal file, and has the sectors allocated for it
removed from the Volume Table of Contents (VTOC).  Whenever you delete a file,
it removes it from the directory, and frees up the sectors it used in the
VTOC. When these files are created, they usually create the file normally,
the delete it, and put back its entry in the VTOC.  These are harder to find
since you must know where to look first.  You will need a disk scanning
program to do this.  If you do not understand how DOS 3.3 disk are formatted
and how files are stored DO NOT attempt to poke around things this way,
unless you make copies of what you're looking at.  It is VERY easy to kill
disks doing this. Read the DOS 3.3 manual first, or Beneath Apple DOS.

Steve Hawley
joevax!sdh