== Description ==
The Z80 microprocessor is an 8-bit [[CPU]] with a 4-bit ALU and a 16-bit address bus capable of direct access to 64k 64KB of memory space. The Z80 is a little-endian CPU, meaning it stores 16-bit values with the least significant byte first, followed by the most significant byte. It has a language of 252 root instructions and with the reserved 4 bytes as prefixes, access to an additional 308 instructions. The Z80 was modelled after the [[8080]] and contains the seventy-eight 8080 opcodes as a subset to its language.
While not in the same league as the Intel 80x86 or the [[Motorola 68000]] series, the Z80 is extremely useful for low cost control applications. One of the more useful features of the Z80 is the built-in refresh circuitry for ease of design with DRAMs.