Semiconductor & Computer Engineering
From WikiChip
Difference between revisions of "4-bit architecture"
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* [[NEC µPD172XX]] | * [[NEC µPD172XX]] | ||
* [[Epson S1C63]] | * [[Epson S1C63]] | ||
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| + | == 4-bit discrete chips == | ||
| + | * [[AMD Am2901]], a 4-bit slice RALU | ||
[[Category:4-bit microprocessors]] | [[Category:4-bit microprocessors]] | ||
Revision as of 10:09, 12 January 2014
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.
Contents
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 architectures.
Applications
Most 4-bit microprocessors were used almost exclusively in calculators and toys.
4-bit microprocessor
- Intel 4004
- Intel 4040
- AMI 9209
- Hitachi HD35404
- National IMP-4
- Fairchild PPS-25
- Rockwell PPS-4
- Rockwell PPS-4/2
- Toshiba T3472
- TMS1000
- NEC μCOM 4
- HP Saturn (64-bit register, 4-bit data path)
4-bit microcontrollers
4-bit discrete chips
- AMD Am2901, a 4-bit slice RALU