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From: perl@rdin.UUCP (Robert Perlberg)
Newsgroups: net.micro.cpm
Subject: Re: Function 37 - drive door open
Message-ID: <347@rdin.UUCP>
Date: Sat, 4-Feb-84 10:37:18 EST
Article-I.D.: rdin.347
Posted: Sat Feb  4 10:37:18 1984
Date-Received: Sat, 28-Jan-84 06:10:09 EST
Lines: 19

Willard Korfhage suggests that the index hole sensor can be used
as a drive door sensor since the disk stops spinning when you
open the door.  This would not work on most 5.25" drives since
the disk times out and stops spinning whenever it is not being
accessed.  (nice try)

As a point of interest to this discussion, Hewlett-Packard used
to make a machine called the HP250.  Although it didn't run CP/M
or anything like it, it had a kind of 8" floppy drive I have
never seen elsewhere.  The drive door could be locked by software
so the user could be physically prevented from removing the disk!
Also, when you closed the door, you could hear the machine accessing
the disk; probably reading the directory.  (Note that the HP250
was a multi-tasking multi-user system.)

Robert Perlberg
Resource Dynamics Inc.
New York
philabs!rdin!rdin2!perl