Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!decvax!harpo!seismo!hao!hplabs!sri-unix!POURNE@mit-mc From: POURNE%mit-mc@sri-unix.UUCP Newsgroups: net.micro.cpm Subject: writing w/o opening Message-ID: <16696@sri-arpa.UUCP> Date: Thu, 16-Feb-84 04:53:00 EST Article-I.D.: sri-arpa.16696 Posted: Thu Feb 16 04:53:00 1984 Date-Received: Mon, 20-Feb-84 02:03:17 EST Lines: 19 From: Jerry E. Pournelleit's not. sigh Date: 24 Jan 84 15:06:00 EST (Tue) From: Mike Ciaraldi To: Info-Cpm at brl-vgr.ARPA, w8sdz at brl.ARPA Re: writing w/o opening Under MP/M, there is a checksum in the FCB. This gets set when you open the file, and you cannot read or write on the file unless this checksum is correct. So, the problem of wiping out your directory by not opening the file first should not occur. I don't know if this technique is used in newer products such as CP/M-86 or CP/M-Plus Mike Ciaraldi ciaraldi@rochester