4-bit

4-bit

The Intel 4004, the world's first commercially available single-chip microprocessor, was a 4-bit CPU. (The F14 CADC was created a year before the 4004, but its existence was classified until 1997.) Also, the HP48 Saturn processor (a commonly used scientific calculator) is basically a 4-bit machine, though it stringsmultiple words together, e.g. its 20-bit memory addressing.

The 1970s saw the emergence of 4-bit software applications for mass markets like pocket calculators.

With 4 bits, it is possible to create 16 different values. All of the hexadecimal numbers can be written with 4 bits.

List of 4-bit Processors

* Intel 4004
* Intel 4040
* Atmel MARC4 core [http://www.atmel.com/products/MARC4/]
* Toshiba TLCS-47 series

External references

* [http://www.hpmuseum.org/saturn.htm Saturn CPU link]


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