48-bit computing: Difference between revisions

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Addressing: Split the IMPI (S/38, CISC AS/400) stuff from the block addressing stuff. S/38 only had the CISC IMPI; AS/400 had both IMPI and PowerAS RISC. Just say they used 48-bit addresses.
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==Addressing==
The [[IBM System/38]], and the [[AS/400]], in its [[complex instruction set computer|CISC]] variants, areuse 48-bit addressing systemsaddresses.

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 [[Ext4]] file system physically limits the file block count to 48 bits.
 
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.