Changes
Z80
,/* 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 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.
The Z80 instruction set is really 3 separate subsets each occupying 256 opcode ‘slots’. The main and CB subsets each occupy the full range of 256 instructions, while the ED subset is mostly empty and only implements 59 instructions. DD and FD instruction prefixes are not counted as they are just modifiersto use the index registers. This means there are 571 unique instructions in the Z80 instruction set.
Although it lacks the raw processing power of processors like the Intel 80x86 or the [[Motorola 68000]] series, the Z80 is extremely useful for low cost control applications.
