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Also, 4-bit CPU and ALU architectures are those that are based on registers , address buses , or data buses of that size. Some of the first microprocessors had a 4-bit word length and were developed around The 4-bit processors were programmed in assembly language or Forth , e. While larger than 4-bit values can be used by combining more than one manually, the language has to support the smaller values used in the combining. If not, assembly is the only option.
The s saw the emergence of 4-bit software applications for mass markets like pocket calculators. In the s and s, a number of research and commercial computers used bit slicing , in which the CPU's arithmetic logic unit ALU was built from multiple 4-bit-wide sections, each section including a chip such as an Am or chip.
While and bit processors are more prominent in modern consumer electronics, 4-bit CPUs continue to be used usually as part of a microcontroller in cost-sensitive applications that require minimal computing power. For example, one bicycle computer specifies that it uses a "4-bit 1-chip microcomputer".
Use of 4-bit processors has declined relative to 8-bit or even bit processors, as they are hard to find cheaper in general computer suppliers' stores. The simplest kinds are not available in any of them, and others are "non-stock" and more expensive. With 4 bits, it is possible to create 16 different values. All single-digit hexadecimal numbers can be written with four bits. Binary-coded decimal is a digital encoding method for numbers using decimal notation, with each decimal digit represented by four bits.
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