4-bit

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Processors
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

Please help improve this section by expanding it. Further information might be found on the talk page or at requests for expansion.

• Intel 4004
• Intel 4040
• Atmel MARC4 core [1]
• Toshiba TLCS-47 series

[edit] External references

• Saturn CPU link