4-bit

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. A group of four bits is also called a nibble and has sixteen (24) possible values. The 1970s saw the emergence of 4-bit software applications for mass markets like pocket calculators. The Zilog Z80, although it is an 8-bit microprocessor, has a 4-bit ALU.

4-bit

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. A group of four bits is also called a nibble and has sixteen (24) possible values. The 1970s saw the emergence of 4-bit software applications for mass markets like pocket calculators. The Zilog Z80, although it is an 8-bit microprocessor, has a 4-bit ALU.