Inaccessible CP/M programs in Altair32 - test-drb@ccmp.vtda.org

26 Nov 2001

CP/M marks a file delete by changing the first byte of the directory
record with E5h to replace a value of 00 to less than 040h. It also 
does so for every file extent for that file in the directory.

A completely empty directory by default contained the E5h mark
as formatters back tehn used that as the data fill on a freshly 
formatted disk.

Allison

-----Original Message-----
From: John Foust &lt;jfoust(a)threedee.com&gt;
To: classiccmp(a)classiccmp.org &lt;classiccmp(a)classiccmp.org&gt;
Date: Monday, November 26, 2001 9:30 AM
Subject: Re: Inaccessible CP/M programs in Altair32

...

When CP/M deleted a file, did it just put a zero
at the start of the filename (like DOS), or did it erase the
entire field?  Perhaps Rich saw deleted files...

- John