Date   : Mon, 04 Oct 2004 19:06:27 +0100 (BST)
From   : Tom Walker <tommowalker@...>
Subject: Re: Load and execution

> I don't think this is documented anywhere, but
> setting b7 of the first
> character of any filename (i.e. offset 08, 10, 18
> etc) stops the file from
> being listed by *CAT.  It can still be seen by *INFO
> *.* or *EX though.
> 
> Anyone know whether this was an official part of the
> DFS spec, whether it
> was actually documented anywhere, and, for a bonus
> point, any titles which
> actually exploited this for a trivial first layer of
> protection?

The DNFS instruction book says that this is one of the
changes from DFS 0.9, that "control characters, top
bit set characters and DELETE in filenames or disc
titles" are not allowed. Doesn't say why though.
Supposedly said files are displayed in *CAT in 0.9, as
the book mentions coloured filenames in mode 7.

Tom


       
       
               
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