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Microprocessor from Zilog, wich which is used in the Amstrad CPC Computers. The Z80/Z80A was a very popular microprocessor, used in a great variety of home computers and appliances as far-fetched as satelitessatellites. It was even used in the Commodore C128 as a secondary processor in order to achieve [[CP/M]] compatibility.

The Z80 microprocessor is an 8 bit [[CPU]] with a 16 bit address bus capable of direct access of to 64k of memory space. It has a language of 252 root instructions and with the reserved 4 bytes as prefixes, acceses access to an additional 308 instructions. The Z80 was modeled modelled after the [[8080]] and contains the 78 seventy- eight 8080 opcodes as a subset to it's its language.

Programming features include an accumulator and six eight 8-bit registers that can be paired as 3-three 16 -bit registers. In addition to the general registers, a stack-pointer, program-counter, and two index (memory pointerspointer) registers are provided. While not in the same leauge 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.

The Z80 comes in a 40 pin DIP package. It has been manufactured in A, B, and C models, differing only in maximum clock speed. It also has been manufactured as a stand-alone microcontroler microcontroller with various configurations of on-chip RAM and EPROM. == Part numbers used in the Amstrad CPC during its lifetime == The Z80 CPU has been manufactured by others, and various Z80s have been used in the construction of the CPC during its lifetime. * SGS Z8400AB1* ST Z8400AB1* ZILOG Z8400APS* ZILOG Z0840004PSC === modern incarnatinons ==={{stub}} Apart from surplus/new Z80-clones that are quite easy to find, many emulations depend on software implementations of the Z80: * The [[T80]] is a [[VHDL|VHDL]] implementation of the Z80 and Z80A, finished in 2002 on [[OpenCores|OpenCores]]* [[arnold]] uses [[InkZ80]], written in C++ (apart from the author-designed C simulation)* On OpenCores, there is also a [[Verilog|Verilog]] implementation of the Z80. [[Zilog]] itself offers the [[eZ80|eZ80]] processor, a new, 50MHz design. Kits now have reached a less-than-prohibitive price range and may be available without a business.

[[Category:Hardware]][[Category:Programming]][[Category:Datasheet]][[Category:CPC Internal Components]]