This article is from the Computer Viruses FAQ, by Nick FitzGerald n.fitzgerald@csc.canterbury.ac.nz with numerous contributions by others.
Yes. If one does though, it has to have a small part resident in
conventional RAM; it cannot reside *entirely* in Extended or in Expanded
RAM. Currently there are no known XMS viruses and only a few EMS
viruses (Emma is an example).
 
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