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==Addressing==
The [[IBM System/38]] and the [[AS/400]], in its [[Complex instruction set computer|CISC]] variants, is a 48-bit addressing system. The address size used in [[logical block addressing]] was increased to 48 bits with the introduction of [[AT Attachment#ATA standards versions, transfer rates, and features|ATA-6]].
The minimal implementation of the [[x86-64]] architecture provides 48-bit addressing encoded into 64 bits; future versions of the architecture can expand this without breaking properly written applications.
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