Article View: comp.sys.ibm.pc.hardware
Article #19879Clock glitch or...virus?
From: Michael Hemy
Date: Mon, 11 Jan 1993 19:39
Date: Mon, 11 Jan 1993 19:39
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Yesterday when using my computer, I noticed that the time was wrong. It was not wrong by 1 or 2 seconds but by a FULL HOUR ! I checked the RTC (real-time clock) and it was correct. So I began wondering what made the DOS time SO different. This was extremely peculiar since you usually expect the DOS time to LAG after the real-time clock, and here I had it AHEAD of it. My first reaction was that there might be a virus lurking in my computer but after thinking about it some more, I came with the following theory: Since DOS is getting it's time initially from the RTC at boot-time, it may be that it is doing so in two (or more) stages, such that first it reads the minutes and then the hours. If this is true and I turned my computer on at 11:59 pm, then it may have read 59 minutes and when it got to read the hours it was 00 (am) already, so that it thought the time was 00:59 am. Can someone that knows DOS internals, shed some light on this or... can some virus expert say something about that phenomenon ? --Michael
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arc1-ca.pugleaf.net!sparky!uunet!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!mhemyShow Full Headers
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Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!mhemy From: mhemy+@cs.cmu.edu (Michael Hemy) Newsgroups: comp.sys.ibm.pc.hardware Subject: Clock glitch or...virus? Message-ID: <C0pFy0.Lsx.1@cs.cmu.edu> Date: 11 Jan 93 19:39:29 GMT Article-I.D.: cs.C0pFy0.Lsx.1 Sender: news@cs.cmu.edu (Usenet News System) Organization: School of Computer Science, Carnegie Mellon Lines: 22 Nntp-Posting-Host: n2.sp.cs.cmu.edu