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On Tue, 25 September 2001, "Draper, Dale" wrote: > Why exactly is it that IBM does not use PC standard memory chipsets? Maybe someone else can say it better but AS/400s need special memory. Every 64 bits of AS/400 memory are accompanied by a special-purpose 65th bit, the 'tag' bit. In short, this extra circuitry provides critical function such as 'tagging' pointers in memory so that they cannot be modified except through approved interfaces. This is a major part of hardware security enforcement and the kind of thing that sets AS/400s apart. Such memory can be used on various other PowerPC systems that can run in 'tags inactive' mode, buth other memory cannot be used in AS/400s. Tom Liotta -- Tom Liotta The PowerTech Group, Inc. 19426 68th Avenue South Kent, WA 98032 Phone 253-872-7788 Fax 253-872-7904 http://www.400Security.com ___________________________________________________ The ALL NEW CS2000 from CompuServe Better! Faster! More Powerful! 250 FREE hours! Sign-on Now! http://www.compuserve.com/trycsrv/cs2000/webmail/
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