
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, and is one of the most popular Central processing unit of all time. 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 24 MB addressing range. ==History== The Z80 came about when Federico Faggin left Intel after working on the Intel 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. 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 Central processing units. Later versions increased in speed from the early models' 2.5 megahertz up to as much as 20 MHz. 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 and clones== Mostek and SGS were second-sources for the Z80. Sharp Corporation and NEC Corporation developed Z80 clones. National Semiconductor developed a CMOS clone, the NSC800, which was not pin compatible. Hitachi (company) developed an enhanced CMOS version which later was second-sourced by Zilog. ==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 Microsoft Windows based machines do As of 2004. In the mid-1980s the Z80 was used in Tatung's Tatung Einstein and the Amstrad CPC 464 and Amstrad PCW home/office computer ranges as well as forming the CPU basis for the MSX computer standard. 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 MOS Technology 6510 based Commodore 64 can make use of the Z80 with an external unit or a plug-in card or cartridge. Notable later uses of the processor include several Texas Instruments graphing calculators (like the TI-85 and TI-83), and Sega's Sega Master System and Sega Game Gear video game consoles. Both the SNK Neo-Geo and Sega 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 system microprocessor and microcontroller core, where it remains in widespread use today. 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. A functionally equivalent CPU core (T80 & TV80) is available for free under a BSD style license as VHDL [http://www.opencores.org/projects.cgi/web/t80/overview] and Verilog [http://www.opencores.org/projects.cgi/web/tv80/overview] source. The VHDL version, once synthesized, can be clocked up to 35 Mhz on a Xilinx Spartan II FPGA. Emulator 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. (* The Sinclair ZX80 and -81 were equipped with the Z80 clone Nippon Electric Corporation uPD780C.) ''See also'': List of home computers by category ==External links== * http://www.zilog.com/ The official site of ZiLOG, Inc. * http://www.z80.info/ A comprehensive collection of Z80 resources * [http://www.mcu51.com/download/digitpdf/CPU/z80/z80-mostek.pdf Mostek Z80 Processor Technical Manual] Microprocessors
==Article title== Following the naming convention for Wikipedia microprocessor articles, I moved the Z80 article back to its Zilog Z80 name after a contributor renamed it Z80. The redirect should be sufficient. --User:Wernher 10:55, 23 Apr 2004 (UTC) Should the list of advantages not also include the important fact that the Z80 did not need complex glue as the 8080 did up until the 8085. That was a big factor too User:AlanCox =="The Z80 was also used in the defense industry"== While military uses of the Z80 may well be worth of investigating, this sentence alone, and slighly out of context, is better left off the article. I've moved it here as a reminder to anyone who knows of any specific uses, or can otherwise elaborate on this sentence. User:LjL 00:16, 28 Apr 2005 (UTC) ==6502 stuff== '' The Z80, and its primary competitor, the MOS Technology MOS Technology 6502, sparked off a series of computer projects that would eventually result in the home computer revolution of the 1980s.'' Aside from the vacuity of the statement, I don't even think it's strictly true. The Apple II and Commodore PET, later Commodore 64, and the Atari game/computer systems, were far more signifcant in the home computer area than the Z80 systems were, at least based on numbers sold. Z80s were important, but never had the penetration that 6502-based systems had in the old 8-bit days. I've taken the statement out. I speculate that if you were to poll people who've written BASIC programs, 3 out of 4 would say their first program was written on a 6502 machine of some kind (well, my first BASIC was on a PDP 11 but I'm older than dirt). My criticisim of Wikipedia is that, often, the article on X immediately sounds like '' ALthough X was great and wonderful, it was immediately replaced by/competed with Y which we all know and use today''. An article about topic X should stay on topic X at least long enough to give the reader a good idea of what X is, before it branches off to talk about the succssors Y and Z, and how Tesla patented W in 1903. --User:Wtshymanski 16:15, 22 May 2005 (UTC) :If that is the case, then shouldn't that statement also be removed from the 6502 article? The Z80 may not be as popular as the 6502 in the US, but however for Japan, Europe and the former USSR (cloned Z80s) it was the CPU of choice, sparking off their home computer markets, so I feel that your statement is a little US-centric. I think the statement is fine, but it could be placed somewhere in the history section, rather than the introduction. :As for your criticism about the divergance in introduction, it seems to be your personal preference. If the majority of articles start off this way, then it seems most people do not have this problem. I think it is a good idea to mention the alternative/competitor/etc in the intro, but again that is personal preference. I would like to know what others feel about this before deciding what to do. :User:ADSR6581 16:54, May 22, 2005 (UTC) ::I would speculate without any sources at all, that there were more home computers sold between 1980 and 1985 in Minneapolis than in the whole of the then-Soviet Union. I don't think the USSR, at least, had much of a part in the so-called "home computer revolution" . The whole field of personal computers is US-centric. Professinally written encyclopedias in my experience don't start contrasts and comparisions until somewhat further into the article than the introductory paragraph. --User:Wtshymanski 17:16, 22 May 2005 (UTC)
#REDIRECT Zilog Z80
See other meanings of words starting from letter:
Words begining with Zilog_Z80:
Zilog_Z80
Zilog_Z80
Zilog_z80
Zilog_Z80,000
Zilog_Z800
Zilog_Z800
Zilog_Z8000
Zilog_Z80000
Zilog Z80
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, and is one of the most popular Central processing unit of all time. 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 24 MB addressing range. ==History== The Z80 came about when Federico Faggin left Intel after working on the Intel 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. 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 Central processing units. Later versions increased in speed from the early models' 2.5 megahertz up to as much as 20 MHz. 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 and clones== Mostek and SGS were second-sources for the Z80. Sharp Corporation and NEC Corporation developed Z80 clones. National Semiconductor developed a CMOS clone, the NSC800, which was not pin compatible. Hitachi (company) developed an enhanced CMOS version which later was second-sourced by Zilog. ==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 Microsoft Windows based machines do As of 2004. In the mid-1980s the Z80 was used in Tatung's Tatung Einstein and the Amstrad CPC 464 and Amstrad PCW home/office computer ranges as well as forming the CPU basis for the MSX computer standard. 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 MOS Technology 6510 based Commodore 64 can make use of the Z80 with an external unit or a plug-in card or cartridge. Notable later uses of the processor include several Texas Instruments graphing calculators (like the TI-85 and TI-83), and Sega's Sega Master System and Sega Game Gear video game consoles. Both the SNK Neo-Geo and Sega 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 system microprocessor and microcontroller core, where it remains in widespread use today. 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. A functionally equivalent CPU core (T80 & TV80) is available for free under a BSD style license as VHDL [http://www.opencores.org/projects.cgi/web/t80/overview] and Verilog [http://www.opencores.org/projects.cgi/web/tv80/overview] source. The VHDL version, once synthesized, can be clocked up to 35 Mhz on a Xilinx Spartan II FPGA. Emulator 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. (* The Sinclair ZX80 and -81 were equipped with the Z80 clone Nippon Electric Corporation uPD780C.) ''See also'': List of home computers by category ==External links== * http://www.zilog.com/ The official site of ZiLOG, Inc. * http://www.z80.info/ A comprehensive collection of Z80 resources * [http://www.mcu51.com/download/digitpdf/CPU/z80/z80-mostek.pdf Mostek Z80 Processor Technical Manual] Microprocessors
Zilog Z80
==Article title== Following the naming convention for Wikipedia microprocessor articles, I moved the Z80 article back to its Zilog Z80 name after a contributor renamed it Z80. The redirect should be sufficient. --User:Wernher 10:55, 23 Apr 2004 (UTC) Should the list of advantages not also include the important fact that the Z80 did not need complex glue as the 8080 did up until the 8085. That was a big factor too User:AlanCox =="The Z80 was also used in the defense industry"== While military uses of the Z80 may well be worth of investigating, this sentence alone, and slighly out of context, is better left off the article. I've moved it here as a reminder to anyone who knows of any specific uses, or can otherwise elaborate on this sentence. User:LjL 00:16, 28 Apr 2005 (UTC) ==6502 stuff== '' The Z80, and its primary competitor, the MOS Technology MOS Technology 6502, sparked off a series of computer projects that would eventually result in the home computer revolution of the 1980s.'' Aside from the vacuity of the statement, I don't even think it's strictly true. The Apple II and Commodore PET, later Commodore 64, and the Atari game/computer systems, were far more signifcant in the home computer area than the Z80 systems were, at least based on numbers sold. Z80s were important, but never had the penetration that 6502-based systems had in the old 8-bit days. I've taken the statement out. I speculate that if you were to poll people who've written BASIC programs, 3 out of 4 would say their first program was written on a 6502 machine of some kind (well, my first BASIC was on a PDP 11 but I'm older than dirt). My criticisim of Wikipedia is that, often, the article on X immediately sounds like '' ALthough X was great and wonderful, it was immediately replaced by/competed with Y which we all know and use today''. An article about topic X should stay on topic X at least long enough to give the reader a good idea of what X is, before it branches off to talk about the succssors Y and Z, and how Tesla patented W in 1903. --User:Wtshymanski 16:15, 22 May 2005 (UTC) :If that is the case, then shouldn't that statement also be removed from the 6502 article? The Z80 may not be as popular as the 6502 in the US, but however for Japan, Europe and the former USSR (cloned Z80s) it was the CPU of choice, sparking off their home computer markets, so I feel that your statement is a little US-centric. I think the statement is fine, but it could be placed somewhere in the history section, rather than the introduction. :As for your criticism about the divergance in introduction, it seems to be your personal preference. If the majority of articles start off this way, then it seems most people do not have this problem. I think it is a good idea to mention the alternative/competitor/etc in the intro, but again that is personal preference. I would like to know what others feel about this before deciding what to do. :User:ADSR6581 16:54, May 22, 2005 (UTC) ::I would speculate without any sources at all, that there were more home computers sold between 1980 and 1985 in Minneapolis than in the whole of the then-Soviet Union. I don't think the USSR, at least, had much of a part in the so-called "home computer revolution" . The whole field of personal computers is US-centric. Professinally written encyclopedias in my experience don't start contrasts and comparisions until somewhat further into the article than the introductory paragraph. --User:Wtshymanski 17:16, 22 May 2005 (UTC)
Zilog z80
#REDIRECT Zilog Z80
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ZA | ZB | ZC | ZD | ZE | ZF | ZG | ZH | ZI | ZJ | ZK | ZL | ZM | ZN | ZO | ZP | ZR | ZS | ZT | ZU | ZW | ZX | ZY |Words begining with Zilog_Z80:
Zilog_Z80
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Zilog_Z80,000
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