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{{Architecture sizes}}
 
{{Architecture sizes}}
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The '''4-bit''' [[computer 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.
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The '''4-bit [[architecture]]''' is a [[microprocessor]] or [[computer]] 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 4-8-bit wide addresses.
  
 
== Industry ==
 
== Industry ==
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Most of the first [[microprocessor]]s during the early 1970s had 4-bit [[word]] length. Both the Intel[[Intel 4004|4004]] and the [[Intel 4040|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-bit architecture|8-]] and [[12-bit architecture]] architectures.
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Most of the first [[microprocessor]]s during the early 1970s had 4-bit [[word]] sizes. Both the Intel {{intel|4004}}, the first commercial microprocessor, and the {{intel|4040}} had a 4-bit word length, but had {{arch|8}} instructions. Some of the first [[microcontroller]]s such as the {{ti|TMS1000}} made by [[Texas Instruments]] and NEC's {{nec|μPD751}} also had 4-bit words. 4-bit word were proven to be very limiting and by 1974 there was a shift to larger architectures such as {{arch|8|8-}} and {{arch|12|12-}} bit architectures.
 +
 
 +
In the [[microcontroller]] domain, the story is a little different. 4-bit microcontrollers found their way into many battery-powered and low power instruments and devices.  Some 4-bit chips such as the {{atmel|MARC4|Atmel MARC4}} continued to be manufactured until very recently (2010s), those devices aimed directly at wireless devices such as RFID-related applications. Other 4-bit MCUs are still made to date such as the [[Epson]]'s {{epson|S1C60}} and {{epson|S1C63}} MCU [[microprocessor family|families]]. Modern 4-bit microprocessors, however, are much different from the first generation microprocessors of the 1970s - in terms of architecture, performance, and overall capabilities.
  
 
== Applications ==
 
== Applications ==
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Most 4-bit [[microprocessor]]s were used almost exclusively in calculators and toys.
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Most of the early 4-bit [[microprocessor]]s were used almost exclusively in calculators and toys, later on for various utilities, video games, controllers, and early computers. 4 bits was a logical choice for many calculators that used [[binary coded decimal|BDC]] numbers representation.
  
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== 4-bit microprocessor ==
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Today, 4-bit chips such as {{epson|S1C60|S1C60 family}} are still manufactured are used in many low-power devices, wireless tools, and [[internet of things]]. Until recently Atmel's {{atmel|MARC4}} was also a large player in the low-power RF/IR wireless market.
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* [[AMI 9209]]
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* [[Fairchild PPS-25]]
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== 4-bit microprocessors ==
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* [[Hitachi HD35404]]
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* {{amd|Am2900|AMD Am2900}}
 +
* {{ami|9209|AMI 9209}}
 +
* {{fairchild|4700|Fairchild 4700}}
 +
* {{fairchild|9400|Fairchild 9400}}
 +
* {{fairchild|PPS-25|Fairchild PPS-25}}
 
* [[HP Saturn]] (64-bit register, 4-bit data path)
 
* [[HP Saturn]] (64-bit register, 4-bit data path)
−
* [[Intel 4004]]
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* {{intel|4004|Intel 4004}} ({{hitachi|hmcs-4/hd35404|HD35404}})
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* [[Intel 4040]]
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* {{intel|4040|Intel 4040}}
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* [[National IMP-4]]
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* {{motorola|10800|Motorola 10800}}
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* [[NEC μCOM 4]]
+
* {{national|IMP-4|National IMP-4}}
−
* [[NEC μCOM 41]]
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* {{rockwell|PPS-4|Rockwell PPS-4}}
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* [[Rockwell PPS-4]]/1
 
−
* [[Rockwell PPS-4/2]]
 
−
* [[TMS1000]]
 
−
* [[Toshiba T3472]]
 
−
* [[WD CR1872]]
 
  
 
== 4-bit microcontrollers ==
 
== 4-bit microcontrollers ==
−
* [[MARC4]]
+
* {{atmel|MARC4|Atmel MARC4}}
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* [[TLCS-47]]
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* {{ami|S2000|AMI S2000}}
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* [[NEC μPD75X]]
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* {{epson|S1C60|Epson S1C60}}
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* [[NEC µPD612X]]
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* {{epson|S1C63|Epson S1C63}}
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* [[NEC µPD172XX]]
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* {{fujitsu|MB88200|Fujitsu MB88200}}
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* [[Epson S1C63]]
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* {{fujitsu|MB8840|Fujitsu MB8840}}/{{fujitsu|MB88400|400}}
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+
* {{fujitsu|MB8850|Fujitsu MB8850}}/{{fujitsu|MB88500|500}}
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== 4-bit discrete chips ==
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* {{hitachi|HD404720|Hitachi HD404720}}
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* [[AMD Am2900]], a family of 4-bit bit slice chips
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* {{hitachi|HMCS40|Hitachi HMCS40}}
 +
* {{hitachi|HMCS400|Hitachi HMCS400}}
 +
* {{itt|7150|ITT 7150}}
 +
* {{matsushita|MN1400|Matsushita MN1400}}
 +
* {{matsushita|MN1500|Matsushita MN1500}}
 +
* {{matsushita|MN1700|Matsushita MN1700}}
 +
* {{mitsu|MELPS 4|Mitsubishi MELPS 4}}
 +
* {{mitsu|M50430|Mitsubishi M50430}}/{{mitsu|M50440|440}}
 +
* {{mitsu|M50460|Mitsubishi M50460}}/{{mitsu|M50560|560}}
 +
* {{mitsu|M5072|Mitsubishi M5072}}/{{mitsu|M5076|M5076}}
 +
* {{mitsu|M5090|Mitsubishi M5090}}
 +
* {{mmi|5700|MMI 5700}}
 +
* {{national|MAPS|National MAPS}}
 +
* {{national|COPS I|National COPS I}}
 +
* {{national|COPS II|National COPS II}}
 +
* {{nec|17K|NEC 17K}}
 +
* {{nec|μCOM-4|NEC μCOM-4}}
 +
* {{nec|μPD751|NEC μPD751}}
 +
* {{nec|μPD707|NEC μPD707}}
 +
* {{nec|μPD7500|NEC μPD7500}}
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* {{nec|μPD75000|NEC μPD75000}}
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* {{oki|OLMS-40|OKI OLMS-40}}/{{oki|OLMS-50|50}}/{{oki|OLMS-60|60}}/{{oki|OLMS-64|64}}/{{oki|OLMS-65|65}}
 +
* {{oki|OLMS-63K|OKI OLMS-63K}}
 +
* {{oki|OLMS-64K|OKI OLMS-64K}}
 +
* {{rockwell|PPS-4-1|Rockwell PPS-4/1}}
 +
* [[Sanyo LC65]]
 +
* [[Sanyo 66xx]]
 +
* [[Sanyo LM64xx]]
 +
* {{sharp|SM|Sharp SM}}
 +
* [[Sony SPC500]]
 +
* {{ti|TMS1000|TI TMS1000}}
 +
* {{toshiba|T3400|Toshiba T3400}}
 +
* {{toshiba|TLCS-42|Toshiba TLCS-42}}
 +
* {{toshiba|TLCS-43|Toshiba TLCS-43}}
 +
* {{toshiba|TLCS-46A|Toshiba TLCS-46A}}
 +
* {{toshiba|TLCS-47|Toshiba TLCS-47}}
 +
* {{toshiba|TLCS-470|Toshiba TLCS-470}}
 +
* {{wd|CR1872 series|WD CR1872}}
 +
* {{wd|WD4200|WD WD4200}}
 +
* {{bell|BELLMAC-4|Bell Labs BELLMAC-4}}
  
 
[[Category:4-bit microprocessors]]
 
[[Category:4-bit microprocessors]]

Latest revision as of 09:37, 12 December 2020

Architecture word sizes
v · d · e

The 4-bit architecture is a microprocessor or computer 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 4-8-bit wide addresses.

Industry[edit]

Most of the first microprocessors during the early 1970s had 4-bit word sizes. Both the Intel 4004, the first commercial microprocessor, and the 4040 had a 4-bit word length, but had 8-bit instructions. Some of the first microcontrollers such as the TMS1000 made by Texas Instruments and NEC's μPD751 also had 4-bit words. 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 architectures.

In the microcontroller domain, the story is a little different. 4-bit microcontrollers found their way into many battery-powered and low power instruments and devices. Some 4-bit chips such as the Atmel MARC4 continued to be manufactured until very recently (2010s), those devices aimed directly at wireless devices such as RFID-related applications. Other 4-bit MCUs are still made to date such as the Epson's S1C60 and S1C63 MCU families. Modern 4-bit microprocessors, however, are much different from the first generation microprocessors of the 1970s - in terms of architecture, performance, and overall capabilities.

Applications[edit]

Most of the early 4-bit microprocessors were used almost exclusively in calculators and toys, later on for various utilities, video games, controllers, and early computers. 4 bits was a logical choice for many calculators that used BDC numbers representation.

Today, 4-bit chips such as S1C60 family are still manufactured are used in many low-power devices, wireless tools, and internet of things. Until recently Atmel's MARC4 was also a large player in the low-power RF/IR wireless market.

4-bit microprocessors[edit]

4-bit microcontrollers[edit]

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