Semiconductor & Computer Engineering
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{{Architecture sizes}} | {{Architecture sizes}} | ||
| − | The '''4-bit [[architecture]] | + | 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 and 8-bit wide addresses. |
== Industry == | == Industry == | ||
| − | Most of the first [[microprocessor]]s during the early 1970s had 4-bit [[word]] | + | 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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== Applications == | == Applications == | ||
| − | Most | + | Most 4-bit [[microprocessor]]s were used almost exclusively in calculators and toys. 4 bits was a logical choice for many calculators that used [[binary coded decimal|BDC]] numbers representation. |
| − | + | == 4-bit microprocessor == | |
| − | + | * [[AMI 9209]] | |
| − | == 4-bit | + | * [[Fairchild 9405]] |
| − | * | + | * [[Fairchild PPS-25]] |
| − | + | * [[Hitachi HD35404]] | |
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* [[HP Saturn]] (64-bit register, 4-bit data path) | * [[HP Saturn]] (64-bit register, 4-bit data path) | ||
| − | * | + | * [[Intel 4004]] |
| − | * | + | * [[Intel 4040]] |
| − | * | + | * [[ITT 7151]] |
| − | * | + | * [[National IMP-4]] |
| − | * | + | * [[NEC μCOM 4]] |
| + | * [[NEC μCOM 41]] | ||
| + | * [[NEC µPD545]] | ||
| + | * [[Rockwell PPS-4]]/1 | ||
| + | * [[Rockwell PPS-4/2]] | ||
| + | * [[TMS1000]] | ||
| + | * [[Toshiba T3472]] | ||
| + | * [[WD CR1872]] | ||
== 4-bit microcontrollers == | == 4-bit microcontrollers == | ||
| − | * | + | * [[AMI S2000]] |
| − | + | * [[Epson S1C63]] | |
| − | * | + | * [[Fujitsu MB8840]]/1 |
| − | + | * [[Hitachi HD404729S]] | |
| − | * | + | * [[National COPS I]] (National MM5781/2) |
| − | + | * [[National COPS II]] | |
| − | * | + | * [[National MM5799]] |
| − | + | * [[National MM57140]] | |
| − | * | + | * [[National MM57152]] |
| − | + | * [[NEC μPD75X]] | |
| − | + | * [[NEC µPD612X]] | |
| − | + | * [[NEC µPD172XX]] | |
| − | + | * [[MARC4]] | |
| − | + | * [[Sanyo LM6402G]] | |
| − | + | * [[Sanyo LC587004]] | |
| − | + | * [[Sanyo LC587008]] | |
| − | + | * [[Sanyo LC58E68]] | |
| − | + | * [[Sharp SM552]] | |
| − | + | * [[TLCS-47]] | |
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| − | + | == 4-bit discrete chips == | |
| − | + | * [[AMD Am2900]], a family of 4-bit bit slice chips | |
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[[Category:4-bit microprocessors]] | [[Category:4-bit microprocessors]] | ||
