From WikiChip
Difference between revisions of "4-bit architecture"

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== 4-bit microprocessor ==
 
== 4-bit microprocessor ==
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* {{amd|Am2900|AMD Am2900}}
 
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* [[AMI 9209]]
 
* {{fairchild|9400|Fairchild 9400}}
 
* {{fairchild|9400|Fairchild 9400}}
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== 4-bit discrete chips ==
 
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* {{amd|Am2900|AMD Am2900}}, a family of 4-bit bit slice chips
 
  
 
[[Category:4-bit microprocessors]]
 
[[Category:4-bit microprocessors]]

Revision as of 18:53, 5 November 2015

Architecture word sizes
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The 4-bit architecture is a microprocessor architecture that has a datapath width or a highest operand width of 4 bits or a nibble. These architectures typically have a matching register file with registers width of 4 bits and 8-bit wide addresses.

Industry

Most of the first microprocessors during the early 1970s had 4-bit word length. Both the Intel4004 and the 4040 were 4-bits. The world's first single-chip microprocessor by Texas Instruments, the TMS1000, was also a 4-bit CPU. 4-bit word were proven to be very limiting and by 1974 there was a shift to larger architectures such as 8- and 12-bit architecture architectures.

Applications

Most 4-bit microprocessors were used almost exclusively in calculators and toys. 4 bits was a logical choice for many calculators that used BDC numbers representation.

4-bit microprocessor

4-bit microcontrollers

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