Xref: utzoo comp.sys.ibm.pc.misc:4229 comp.sys.ibm.pc.hardware:3501 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!ucsd!ucbvax!techunix.BITNET!blue From: blue@techunix.BITNET (Baruch Cochavy) Newsgroups: comp.sys.ibm.pc.misc,comp.sys.ibm.pc.hardware Subject: Re: Need to disable A: and B: Message-ID: Date: 30 Nov 90 15:42:45 GMT References: <11754@hubcap.clemson.edu> <1990Nov26.164711.13988@maverick.ksu.ksu.edu> Sender: daemon@ucbvax.BERKELEY.EDU Followup-To: comp.sys.ibm.pc.misc Lines: 19 There is only one way to disable A: and B: all together: 1. Modify the FD board so it will decode a different address. 2. Modify the BIOS to have a controlled access to the FD services. Viri can only access what is know and common. BIOS services are common enough, but a clever one can access the FD controller directly. Only way to be safe, then, it to change the environment so that those assumptions needed for the virus to work are gone. Now, this does have some drawbacks: some of DOS utilities do work based upon these assumptions. I argue, however, that those are not the one a regular student needs ... -- Baruch Cochavy | Disk space -- | blue@techunix.BITNET Technion | the final frontier ! | blue@techunix.technion.AC.IL Haifa 32000 | | phone: (972)-4-292904 ISRAEL | | (972)-4-387520