4-bit

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Microprocessors
4-bit	8-bit	16-bit	24-bit	31-bit	32-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.

[edit] List of 4-bit CPUs

[edit] 4-bit Intel CPUs

• Intel 4004
• Intel 4040

[edit] External references

• Saturn CPU link