4-bit
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Processors | |||||||||||
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4-bit | 8-bit | 12-bit | 16-bit | 18-bit | 24-bit | 31-bit | 32-bit | 36-bit | 48-bit | 64-bit | 128-bit |
Applications | |||||||||||
8-bit | 16-bit | 31-bit | 32-bit | 64-bit | |||||||
Data Sizes | |||||||||||
4-bit | 8-bit | 16-bit | 32-bit | 64-bit | 128-bit | ||||||
nibble byte octet word dword qword |
In computer architecture, 4-bit integers, memory addresses, or other data units are those that are at most 4 bits wide. Also, 4-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. 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.) Also, the HP48 Saturn processor (a commonly used scientific calculator) is basically a 4-bit machine, though it strings multiple 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.
Binary | Octal | Decimal | Hexadecimal |
---|---|---|---|
0000 | 0 | 0 | 0 |
0001 | 1 | 1 | 1 |
0010 | 2 | 2 | 2 |
0011 | 3 | 3 | 3 |
0100 | 4 | 4 | 4 |
0101 | 5 | 5 | 5 |
0110 | 6 | 6 | 6 |
0111 | 7 | 7 | 7 |
1000 | 10 | 8 | 8 |
1001 | 11 | 9 | 9 |
1010 | 12 | 10 | A |
1011 | 13 | 11 | B |
1100 | 14 | 12 | C |
1101 | 15 | 13 | D |
1110 | 16 | 14 | E |
1111 | 17 | 15 | F |
[edit] List of 4-bit Processors
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- Intel 4004
- Intel 4040
- Atmel MARC4 core [1]
- Toshiba TLCS-47 series