ciaraldi@Rochester.ARPA (01/24/84)
From: Mike Ciaraldi <ciaraldi@Rochester.ARPA> 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
POURNE%mit-mc@sri-unix.UUCP (02/16/84)
From: Jerry E. Pournelle <POURNE@mit-mc> it's not. sigh Date: 24 Jan 84 15:06:00 EST (Tue) From: Mike Ciaraldi <ciaraldi at Rochester.ARPA> 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