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The Zilog Z80 is an 8-bit microprocessor designed and manufactured by Zilog from 1976 onwards. It was widely used both in desktop and embedded computer designs as well as for defense purposes, and is one of the most popular CPUs of all time. 8-bit refers to the number of bits used in the data bus of a computer. ... Microprocessors, including an Intel 80486DX2 and an Intel 80386 A microssor (abbreviated as µP or uP) is a computer electronic component made from miniaturized transistors and other circuit elements on a single semiconductor integrated circuit (IC) (aka microchip or just chip). ... ZiLOG, often seen as Zilog, is a manufacturer of 8-bit CPUs, and is most famous for its Intel 8080-compatible Z80 series. ... Jump to: navigation, search 1976 is a leap year starting on Thursday (link will take you to calendar). ... An embedded system is a special-purpose computer system, which is completely encapsulated by the device it controls. ... This article needs to be cleaned up to conform to a higher standard of quality. ...

Zilog Z80 microprocessor.
Zilog Z80 microprocessor.

Although Zilog made several attempts to move off the Z80 onto more powerful 16-bit (Zilog Z800, Zilog Z8000, Zilog Z180, Zilog Z280) and 32-bit (Zilog Z80000, Zilog Z380) platforms, other companies were offering CPUs in this performance range years earlier, and the Zilog chips never caught on. Zilog’s most recent CPU is the Zilog eZ80, a faster Z80 with a 16 MB addressing range. This work is copyrighted. ... This work is copyrighted. ... The Zilog Z800 was a 16-bit microprocessor designed by Zilog to be released in 1985. ... The Z8000 was a 16-bit microprocessor introduced by ZiLOG in 1979. ... The Zilog Z180 processor is the successor of the Z80. ... The Z280 is a Zilog 16 bit, Z80 compatible processor from 1987. ... The Z80000 was Zilogs 32-bit processor from 1986, an expansion of its 16-bit predecessor, the Zilog Z8000. ... Zilogs 32 bit processor from 1994. ... The ZiLOG eZ80 is essentially an updated version of the companys earlier Z80 8-bit microprocessor. ...

Contents


History and description

The Z80 came about when Federico Faggin left Intel after working on the 8080, and by July 1976 Zilog had the Z80 on the market. It was designed to be binary compatible with the Intel 8080 so that most 8080 code could run unmodified on it, notably the CP/M operating system. Bio Federico Faggin (born 1941) is a physicist and electrical engineer considered to be one of the inventors of the microprocessor. ... Intel Corporation (NASDAQ: INTC) (founded 1968) is a U.S.-based multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... Intel C8080A processor. ... Intel C8080A processor. ... CP/M (Command Processor for Microcomputers) was an operating system for Intel 8080/85 and Zilog Z80 based microcomputers. ...


The Z80 offered eight real improvements over the 8080:

  • An enhanced instruction set including new IX and IY index registers and instructions for them
  • Two separate register files, which could be quickly switched, to speed up response to interrupts
  • Block move, block I/O, and byte search instructions
  • Bit manipulation instructions
  • A built-in DRAM refresh address counter that would otherwise have to be provided by external circuitry
  • Single 5 Volt power supply
  • Fewer outboard support chips required for clock generation and interface to memory and I/O
  • A much lower price

The Z80 quickly took over from the 8080 in the market, and became one of the most popular 8-bit CPUs. Later versions increased in speed from the early models' 2.5 MHz up to as much as 20 MHz. An instruction set, or instruction set architecture (ISA), describes the aspects of a computer architecture visible to a programmer, including the native datatypes, instructions, registers, addressing modes, memory architecture, interrupt and exception handling, and external I/O (if any). ... An index register in a computer CPU is a processor register used for modifying operand addresses during the run of a program, typically for doing vector/array operations. ... A register file is an array of processor registers in a central processing unit (CPU). ... In computer science, an interrupt is a signal from a device which typically results in a context switch: that is, the processor sets aside what its doing and does something else. ... Dram can mean several things: for the imperial unit of volume see dram (volume) for the imperial unit of weight or mass see avoirdupois and apothecaries system of mass for the Armenian monetary unit see dram (currency) DRAM is a type of RAM and unlike dram is spelled in all... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ...


Perhaps a key to the success of the Z80 was the built-in DRAM refresh, which allowed systems to be built with fewer support chips.


Second sources, clones, emulation

Mostek and SGS were second-sources for the Z80. Sharp and NEC developed Z80 clones. National Semiconductor developed a CMOS clone, the NSC800, which was not pin compatible. Hitachi developed an enhanced CMOS version which later was second-sourced by Zilog. Mostek was founded in 1969 by ex-employees of Texas Instruments. ... STMicroelectronics logo. ... Sharp Corporation (シャープ株式会社 Shāpu Kabushiki Gaisha) is a Japan-based electronics manufacturer, founded in 1912. ... NEC Corporation (TYO: 6701), (NASDAQ: NIPNY), LSE: NEC is a multi-national information technologies company headquartered in Minato-ku, Tokyo, Japan. ... Categories: Electronics companies of the United States | Companies based in California | Corporation stubs ... Hitachi (Japanese: 日立製作所) is a manufacturer based in Ochanomizu, Tokyo, Japan. ...


In East Germany, an unlicenced clone of the Z80, known as the U880, was manufactured. It was very popular and was used in Robotron's and VEB Mikroelektronik Mühlhausen's computer systems (e.g. the KC85-series) and also in many self-made computer systems (ex. COMP JU+TER). In Romania, several Z80 clones were manufactured: HC85, HC90, HC91, HC2000 (by the Felix Computers Factory, based in Bucharest) and TimS (by the Timisoara Technical University). The HC85 and TimS clones were the most popular models. The German Democratic Republic (GDR) (German: Deutsche Demokratische Republik), also commonly known as East Germany, was a communist state that existed from 1949 to 1990 in the former Soviet occupation zone of Germany. ... This article is about the company. ... The KC85 (KC standing for Kleincomputer, or small computer) was a model of microcomputer built in East Germany , firstly in 1984 by Robotron (the KC85/1) and later by VEB Mikroelektronik Wilhelm Pieck Mühlhausen (KC85/2, KC85/3 and KC85/4) Contents // Categories: Stub | Home computers ... The DâmboviÅ£a River in central Bucharest Along a small tributary of DâmboviÅ£a, named Colentina, several lakes stretch across the city, the most important being Lake Floreasca, Lake Tei and Lake Colentina. ... Map of Romania showing Timisoara Timişoara  listen (Hungarian: Temesvár, German: Temeschwar or Temeschburg, Serbian: Temišvar, Turkish: Tamışvar) is a city in western Romania, in the Banat region, Timiş county, population 329,554 in 2000. ...

T34BM1, a Soviet Z80 clone.
T34BM1, a Soviet Z80 clone.

Also, several fully compatible analogues of Z80 were created in the Soviet Union, a notable one being the T34. Another Soviet clone, the KP580BM80, was an analogue of the Z80's predecessor, the Intel 8080. Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...


Today, a functionally equivalent CPU core (T80 & TV80) is available for free under a BSD style license as VHDL [1] and Verilog [2] source. The VHDL version, once synthesized, can be clocked up to 35 Mhz on a Xilinx Spartan II FPGA. Software emulation of the Z80 instruction set on modern PCs runs faster than the original Z80 CPU ran and is used today with the MAME video game emulator's execution of 1980's vintage video games. 2005 is a common year starting on Saturday of the Gregorian calendar. ... VHDL or VHSIC Hardware Description Language, is commonly used as a design-entry language for FPGAs and ASICs in electronic design automation. ... The Verilog HDL is a hardware description language, used for the design of ASICs and FPGAs in order to make digital circuits. ... U.S. corporation Xilinx, Inc. ... A field-programmable gate array or FPGA is a gate array that can be reprogrammed after it is manufactured, rather than having its programming fixed during the manufacturing — a programmable logic device. ... An emulator reproduces an arcade games playable atmosphere on a Windows computer. ... MAME is a computer software program for personal computers. ...


Notable uses

By the early 1980s it was used in a host of home computer designs including the MSX, Radio-Shack TRS-80, Sinclair ZX80* & ZX81* and ZX Spectrum. It was also featured in the Osborne 1, the Kaypro, and a great number of fairly anonymous business-oriented CP/M machines that dominated the market of the time in the way that Windows based machines do today. In the mid-1980s the Z80 was used in Tatung's Einstein and the Amstrad CPC and PCW home/office computer ranges as well as forming the CPU basis for the MSX computer standard. The Z80 was also used in the Norwegian Tiki 100 computers, which were the computers of choice for Norwegian schools during the late 1980s. Jump to: navigation, search // Events and trends The 1980s marked an abrupt shift towards more conservative lifestyles after the momentous cultural revolutions which took place in the 1960s and 1970s and the definition of the AIDS virus in 1981. ... The home computer is a consumer-friendly word for the second generation of microcomputers (the technical term that was previously used), entering the market in 1977 and becoming common during the 1980s. ... Jump to: navigation, search MSX is the name of a standard for home computers in the 1980s (see also The Home Computer Era in the History of computing hardware). ... TRS-80 Model I TRS-80 (also affectionately or derisively known as the Trash-80) was the designation for several lines of microcomputer systems produced by the Tandy Corporation and sold through its Radio Shack stores in the late-1970s and 1980s. ... The Sinclair ZX80 was a home computer brought to market in 1980 by Sinclair Research. ... The Sinclair ZX81 home computer, released by Sinclair Research in 1981, was the followup to the companys ZX80. ... Jump to: navigation, search The Sinclair ZX Spectrum was a small home computer released in the United Kingdom in 1982 by Sinclair Research. ... The Osborne 1, created by publisher Adam Osborne and released in April 1981, was the first portable all-in-one microcomputer. ... Kaypro was a manufacturer of portable1 microcomputers running the CP/M OS. Their first model, the Kaypro II, was launched late in 1982 at a price of US$1795, and was built around a 2. ... CP/M is an operating system created for Intel 8080/85 and Zilog Z80 based microcomputers by Gary Kildall of Digital Research, Inc. ... Jump to: navigation, search Microsoft Windows is a range of operating environments for personal computers and servers. ... 2005 is a common year starting on Saturday of the Gregorian calendar. ... The Tatung Einstein was an eight-bit home/personal computer produced by Taiwanese corporation Tatung but designed and assembled in England, at Telford. ... The Amstrad CPC 464 was an 8-bit home computer produced by Amstrad in the 1980s. ... The Amstrad PCW series (Personal Computer Word processor) was British company Amstrads versatile line of home/personal microcomputers pitched as a complete, integrated home/office solution. ... Jump to: navigation, search MSX is the name of a standard for home computers in the 1980s (see also The Home Computer Era in the History of computing hardware). ... Tiki 100 was a desktop home/personal computer manufactured by Tiki Data of Oslo, Norway. ...


Such was the popularity of the Z80 and CP/M that the Commodore 128 featured a Z80 processor alongside its MOS Technology 8502 processor for compatibility. Other 6502 based computers already on the market such as the BBC Micro, Apple II and the 6510 based Commodore 64 can make use of the Z80 with an external unit or a plug-in card or cartridge. The Commodore 128 is a home/personal computer, also known as the C128. ... The MOS Technology 8502 was MOSs microprocessor used as one of the two¹ CPUs in the Commodore 128 home/personal computer. ... The MOS Technology 6502 is an 8-bit microprocessor designed by MOS Technology in 1975. ... The BBC Micro, affectionately known as the Beeb, was an early home computer. ... The Apple II was one of the most popular personal computers of the 1980s. ... The MOS Technology 6510, also known as MOS Technology / Commodore Semiconductor Group (CSG) 8500, is a microprocessor designed by MOS Technology, and is a direct successor of the very successful 6502. ... Commodore 64 (1982) The Commodore 64 (C64, CBM 64, C=64) is a home computer with 64 kilobytes of RAM that was popular in the 1980s. ... In a variety of electronic equipments, a cartridge (in video game terms, cart, game pack, or Game Pak) can be one method of programming different functionality, providing variable content, or a method by which consumables may be replenished. ...


The Multitech Microprofessor I, introduced in 1981, is a simple and inexpensive training system for the Z80 microprocessor. As of early 2005, it is still on market. Microprofessor I (MPF 1), introduced in 1981, was Acers first branded computer product and probably one of the worlds longest selling computers. ... 1981 is a common year starting on Thursday of the Gregorian calendar. ... Jump to: navigation, search 2005(MMV) is a common year starting on Saturday of the Gregorian calendar. ...


Notable later uses of the processor include several Texas Instruments (TI) graphing calculators (like the TI-85, TI-84 and TI-83), and Sega's Master System and Game Gear video game consoles. Both the SNK Neo-Geo and Sega Mega Drive/Genesis consoles use it as an audio coprocessor. Nintendo's Game Boy and Game Boy Color handheld game systems used a Z80 clone manufactured by Sharp Corporation, which had a slightly different instruction set. The Sharp Z80 in the Game Boy Color is notable for its ability to selectively double its clock speed when running Game Boy Color software. The Zilog Z80 has also become a popular embedded microprocessor and microcontroller core, where it remains in widespread use today. Many classic coin-op arcade games used the Z80 as a main CPU or sound coprocessor. Texas Instruments headquarters in Dallas Texas Instruments NYSE: TXN, better known in the electronics industry as TI, is a company based in Dallas, Texas, renowned for developing and commercializing semiconductor and computer technology. ... A graphing calculator is a special kind of scientific/engineering calculator that is able to display and/or analyze mathematical function graphs. ... Categories: Stub | Graphing calculators ... Categories: Stub | Graphing calculators ... The TI-83 series graphing calculators are manufactured by Texas Instruments. ... Sega (セガ) is a video game software and hardware developer, and a former home computer and console manufacturer. ... Sega Master System The Sega Master System (SMS for short) (Japanese: マスターシステム), is an 8-bit cartridge-based gaming console manufactured by Sega. ... Jump to: navigation, search The Sega Game Gear was Segas first portable gaming system. ... The Nintendo GameCube is an example of a current generation video game console. ... The original Neo-Geo console was greatly advanced for its time. ... The Mega Drive/Genesis was a 16-bit video game console released by Sega in Japan (1988), Europe (1990) and most of the rest of the world as the Mega Drive. ... Audio can mean: Sound that can be heard. ... A coprocessor is a computer processor used to supplement the functions of the primary processor (the CPU). ... Jump to: navigation, search Nintendo (Japanese: 任天堂; (NASDAQ: NTDOY), (TYO: 7974)) was originally founded in 1889 by Fusajiro Yamauchi to produce handmade hanafuda cards, for use in a Japanese playing card game of the same name. ... The original Game Boys design set the standard for handheld gaming consoles. ... The Game Boy Color came in a myriad different colors, as did earlier incarnations of the Game Boy. ... Sharp Corporation (シャープ株式会社 Shāpu Kabushiki Gaisha) is a Japan-based electronics manufacturer, founded in 1912. ... An embedded system is a special-purpose computer system, which is completely encapsulated by the device it controls. ... A microcontroller is a computer-on-a-chip optimised to control electronic devices. ...


(* The Sinclair ZX80 and -81 were equipped with the Z80 clone NEC uPD780C.) NEC Corporation is a multi-national information technologies company headquarterd in Minato-ku, Tokyo, Japan. ...


See also: List of home computers by category This is a list of home and office computers by category where the main category is the home computers CPU wordlength (8/16/32 bits) and the subcategory is the specific CPU used in each machine. ...


External links

  • http://www.zilog.com/ The official site of ZiLOG, Inc.
  • http://www.z80.info/ A comprehensive collection of Z80 resources
  • List of Z80 software emulators at Zophar.net


ZiLOG processors Compatibles

Z80 series: Z80 | Z180 | Z280 | Z380 | Z800 | eZ80
Z8000 series: Z8000 | Z80,000 | Microcontroller: Z8 ZiLOG, often seen as Zilog, is a manufacturer of 8-bit CPUs, and is most famous for its Intel 8080-compatible Z80 series. ... The term compatibility has the following meanings: In telecommunication, the capability of two or more items or components of equipment or material to exist or function in the same system or environment without mutual interference. ... The Zilog Z180 processor is the successor of the Z80. ... The Z280 is a Zilog 16 bit, Z80 compatible processor from 1987. ... Zilogs 32 bit processor from 1994. ... The Zilog Z800 was a 16-bit microprocessor designed by Zilog to be released in 1985. ... The ZiLOG eZ80 is essentially an updated version of the companys earlier Z80 8-bit microprocessor. ... The Z8000 was a 16-bit microprocessor introduced by ZiLOG in 1979. ... The Z80,000 was Zilogs 32-bit processor from 1986, an expansion of its 16-bit predecessor, the Zilog Z8000. ... The Zilog Z8 is a family of microcontrollers from Zilog with on-chip RAM and (optional) ROM. Note that the Z8 is not related to the Zilog Z80, it uses a totally different architecture and instruction set. ...

Z80 series: NEC uPD780C | Sharp LH-0080 | T34
ASCII R800 | U880 NEC Corporation (TYO: 6701), (NASDAQ: NIPNY), LSE: NEC is a multi-national information technologies company headquartered in Minato-ku, Tokyo, Japan. ... Sharp Corporation (シャープ株式会社 Shāpu Kabushiki Gaisha) is a Japan-based electronics manufacturer, founded in 1912. ... The R800 is the CPU used in the MSX turboR. It was designed by ASCII, and the goals were to have the fastest CPU possible, while mantaining compatibilty with old MSX hardware and software. ...


  Results from FactBites:
 
Jupiter Ace Resource Site - Z80A chip info (702 words)
Used by the CPU to signal to external devices that the system buses are in the high impedance state and available for their use.
The Z80A CPU contains 18 8-bit and four 16-bit registers, jointly constituting a total of 208 bits of read/write memory accessible to the programmer.
The contents of the R register are sent to the lower eight bits of the address bus during the refresh period.
  More results at FactBites »

 
 

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