Date   : Mon, 04 Oct 2004 14:24:12 +0100
From   : Richard_Talbot-Watkins@...
Subject: Re: Load and execution

jgh wrote on 04/10/2004 12:14:29:

> DFS Sector 0 contains the list of files on the DFS disk:
>
> 00-07: Disk title first 8 characters
> 08-0E: First filename
> 0F   : First filename's directory, b7=locked
> 10-16: Second filename
> 17   : Second filename's directory, b7=locked
> etc.

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?

Rich



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