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From: vail@tegra.com (Johnathan Vail)
Newsgroups: comp.virus
Subject: Re: SCAN program for IBM's (PC)
Message-ID: <0011.9101151325.AA04099@ubu.cert.sei.cmu.edu>
Date: 14 Jan 91 20:22:24 GMT
Sender: Virus Discussion List <VIRUS-L@LEHIIBM1>
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Approved: krvw@sei.cmu.edu

PFKLAMMER@CUDENVER.BITNET (Pete Klammer/303-556-3915) writes:

   >Only one problem with that idea: How can the machine tell when a disk
   >is inserted?  There isn't any type of sensor in IBM floppy drives like
   >in the Mac.
   >Doug Barlow

   Isn't the write-protect sensor status available for polling?  If you
   constantly (once per clock tick) check the write-protect detector, you
   could see the "shadow" of the diskette sleeve (write protected or not)
   as the disk is inserted or removed.  I.e., if the detector toggles in
   any way, a diskette has been either inserted or removed.

If I remember correctly the drve has to be selected.  Even if this is
possible and isn't precluded by door open, etc., it definately won't
work while another drive is selected and being used.

jv

"Live Free or Die, Death is the lesser of the two evils" -- General John Stark
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