48-bit computing: Difference between revisions

Revision as of 22:56, 16 September 2014

Revision as of 23:27, 4 October 2014

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{{Unreferenced|date=August 2007}}

{{Computer architecture bit widths}}

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==Word size==

Computers with 48-bit [[Word (data type)|words]] include the [[AN/FSQ-32]], [[Control Data Corporation|CDC]] [[1604]]/[[CDC 3000|upper-3000 series]], [[BESM#BESM-6|BESM-6]], [[Ferranti]] [[Atlas (computer)|Atlas]], and [[Burroughs large systems]] (B5xxx-B8xxx, which additionally had a 3-4 type tag).

==Addressing==

The [[IBM System/38]] and the [[AS/400]], in its [[Complex instruction set computer|CISC]] variants, are 48-bit addressing systems. 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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==Images==

{{see also|Deep color}}

In digital images, 48 bits per pixel, or 16 bits per each color channel (red, green and blue), is used for accurate processing. For the human eye, it is almost impossible to see any difference between such an image and a 24-bit image{{Citation Neededneeded|date=June 2013}}, but the existence of more shades of each of the three primary colors (65,536 as opposed to 256) means that more operations can be performed on the image without risk of noticeable [[Colour banding|banding]] or [[posterization]].

{{CPU technologies}}