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This article is from the Computer Viruses FAQ, by Nick FitzGerald n.fitzgerald@csc.canterbury.ac.nz with numerous contributions by others.

50 Can a PC virus hide in Extended or in Expanded RAM in a PC?

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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