Re: Is there a 1024 virus? (PC)

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Article #4542

#4542

From: Fridrik Skulason
Date: Sat, 15 Jun 1991 09:12

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Arthur Buslik writes:

>As Rob Slade suggests, one possibility is a virus.  However, a much
>more likely possibility is that the computers have extended bios
>extended data areas.
:
>Moreover, INT 15H, AH=C1H will return the segment address
>of the base of the extended bios area.

Well, not always - I have a HP/Vectra, where the BIOS reserves a 4K
area just below the 640K mark.  However, INT 15H, AH=C1H is not
implemented in the BIOS (I know - I traced through it), and INT 15H,
AH=C0H will return the information that no Extended BIOS area is used.

- -frisk

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From: frisk@rhi.hi.is (Fridrik Skulason)
Newsgroups: comp.virus
Subject: Re: Is there a 1024 virus? (PC)
Message-ID: <0013.9106171414.AA16331@ubu.cert.sei.cmu.edu>
Date: 15 Jun 91 09:12:01 GMT
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