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Topic: Z80

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	Zilog Z80
		The Z80 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 three real improvements over the 8080: a built-in memory controller for DRAM that would otherwise have to be provided by external circuitry, a much lower price, and a limited ability for SIMD (Single Instruction, Multiple Data) with block move and copy instructions.
		The Z80 quickly took over from the 8080 in the market, and became the most popular 8-bit CPU of all time - indeed, if one takes the absolute size of the market into account, the most sucessful CPU ever.
	www.ebroadcast.com.au /lookup/encyclopedia/z8/Z80.html (296 words)

	Z80 (Site not responding. Last check: 2007-10-20)
		Z80 is an emulator for the Intel 8080 and 8085 processors, and the Zilog Z80 processor.
		Z80 is provided free of charge and with no warranty whatsoever including any warranty of fitness for any purpose including MERCHANTABILITY.
		Source is included for the emulator itself, but the subroutine library used by the emulator is available separately (however, the subroutine library has evolved and probably won't compile with Z80 in its current form).
	cef.sourceforge.net /z80 (331 words)

	An Example of a Real Computer: the Z80 (Site not responding. Last check: 2007-10-20)
		The Z80 is a CPU - central processing unit - having the ability to fetch and execute machine language instructions.
		Z80 CPU architecture -- --- --- ------------ TRANSPARENCY: Z80 ARCHITECTURE A. The Z80 is a pure 8-bit microprocessor, which means that its internal registers and data paths (as well as its external data bus) are 8 bits wide.
		C. The Z80 is basically a one-accumulator machine, which means that for most arithmetic and logical operations the A register (the accumulator) contains one of the source operands and receives the result of the operation.
	www.cs.gordon.edu /local/courses/cs221/lectures/z80.html (1824 words)

	The Z80 Lives!
		Whenever an IN A,(C) or OUT (C),A instruction is executed, both the Z80 and 64180 issue the contents of C as the low order port address, and the contents of B as the high 8 bits of the address.
		On the Z80, all mode 2 vectors are taken from a table in the memory page specified by the setting of the I register (which can be accessed by the LD I,A instruction).
		The 84C50 is a Z80 with 2k of RAM.
	www.z80.info /z80lives.htm (2608 words)

	Zilog Z80 8-Bit Microprocessor (Site not responding. Last check: 2007-10-20)
		Z80 and the Z80 assembly language are trademarks of ZILOG, Inc.)
		The Z80 microprocessor is an 8 bit CPU with a 16 bit address bus capable of direct access of 64k of memory space.
		The Z80 was modeled after the 8088 and contains the 78 - 8088 opcodes as a subset to it's language.
	www.ee.washington.edu /circuit_archive/micro/z80.html (266 words)

	Z80 Project
		Both the Z80 and the programmer are connected to the memory the usual way, but there is a simple logic circuit that controls their access to the memory.
		When the programmer releases the memory, Z80 recovers from the reset state and starts executing the code in the memory.
		Switching between the programmer and the Z80 run modes is done by toggling a switch.
	www.geocities.com /dinceraydin/z80/project.htm (717 words)

	Dynamic RAM Design & Interfacing - THE Z80 CPU : TIMING
		The Z80 samples the data on its' data bus on the rising edge of the clock.
		Data must be stable at the pins of the Z80 CPU chip some time before the rising edge of the clock to ensure that the Z80 reads correct data.
		In the case of the 4 MHz Z80, it could be as long as 85ns after the clock.
	www.sxlist.com /techref/mem/dram/slide4.html (1054 words)

	Zophar's Domain: Z80 (Site not responding. Last check: 2007-10-20)
		This Z80 Cpu emulator was coded in 32 bit assembly by Neil Bradley.
		This is the famous Z80 emulator from Marat Fayzullin, author of many different emulation projects including Virtual Gameboy.
		His Z80 cpu emulator was also used in other authors' projects, such as Massage 0.6.
	www.zophar.net /z80.html (203 words)

	The Z80 Microprocessor
		At their new company Faggin and Shima designed a microprocessor that was compatible with Intel's 8080 (it ran all 78 instructions of the 8080 in exactly the same way that Intel's chip did) but had many more abilities (an extra 120 instructions, many more registers, simplified connection to hardware).
		The flags are changed whenever an arithmetic operation is done and the flags can be tested one at a time by a jump instructions to change the flow of the program, depending on the state of the flag.
		The Z80 allows three combinations: registers B and C can be combined to form a 16-bit register that is called BC, registers D and E combined to form DE, and H and L combined to form HL.
	www.landley.net /history/mirror/cpm/z80.html (1547 words)

	Thomas Scherrer Z80-Family Official Support Page
		Z80 CPU Pictures See what we are talking about.
		PowerPoint Presentation of the Z80 CPU internal block diagram, showing active lines and microinstructions in each T state during execution of 4 assembler instructions and INT request (Italian and English).
		Z80 programming guide based upon the original Zilog manuals and restructuring of the data.
	www.z80.info (1031 words)

	Introduction to Z80 Assembler
		The Z80 is one of the most popular microprocessors of the 80's having been used in many home computers systems of that era.
		The Z80 stores its numbers and does all its maths (most of the time) using registers - these are a set of 8 bit numbers that are stored internally (actually it's a bit more complicated by we'll get to that in a bit).
		The Z80 cannot know whether or not a number is positive or signed in this system and handle the two zeros correctly for subsequent instructions.
	www.worldofspectrum.org /Z80.html (4900 words)

	Zilog Z80 microprocessor family
		Zilog Z80 microprocessor is an 8-bit CPU object-code compatible with Intel 8080 CPU.
		The Zilog Z80 microprocessor was second sourced by many companies.
		Z80 microprocessors were released in July 1976 (May 1976 according to Federico Faggin's www.intel4004.com website).
	www.cpu-world.com /CPUs/Z80 (218 words)

	Z80 microprocessor: Rabbit 8-bit Microprocessor Series
		Low-cost Development Kits are available from only $139 US and include Rabbit processor with core module and/or development board, Dynamic C® software and documentation on CD-ROM, serial cable for programming and debugging, AC adapter (U.S./Canada only), and Getting Started manual.
		While it runs three times faster, the Rabbit shares a similar architecture and a high degree of compatibility with the Z80 and Z180, but with key improvements for superior performance and ease of use.
		Programmers familiar with the Z80 will be completely at ease with the Rabbit 2000.
	www.rabbitsemiconductor.com /etc/Z80.shtml (315 words)

	Icarus Productions - Z80 FAQ
		The Z80 is indeed a very old processor, I think it was first released in 1977 (correct me if I'm wrong).
		As the Z80 is an 8-bit processor, these registers are all 8-bit wide, this means they can hold any value from 0-255 (= 8 bit or one byte).
		Finally, this bit is also used for two unrelated functions: during the block transfer and search instructions, this flag is used to detect whether the counter register BC has attained the value 0.
	icarus.ticalc.org /articles/z80_faq.html (2404 words)

	Zilog Z80 (Site not responding. Last check: 2007-10-20)
		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.
		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.
	www.mrsci.com /Microprocessors/Zilog_Z80.php (900 words)

	Dontronics - Z80 Page.
		Connector J1 on the PBUFF board is an extension of the Z80 chip pinout and is used for connection to FPIO and C3P1 boards, or user prototype boards.
		To re-connect this bus for any reason, 26 pin male headers can be soldered into the J2 and J7 positions, and a short length of 26 wire flat ribbon cable that has two IDC crimp headers attached to either end can be inserted onto the male header pins.
		ZLOAD is a Z80 development tool used to accept a super fast down load of Z80 machine code from the Centronics printer port of an MS-DOS PC.
	www.dontronics.com /z80.html (2588 words)

	R. T. Russell: BBC BASIC (Z80) (Site not responding. Last check: 2007-10-20)
		BBC BASIC (Z80) is an implementation of BBC BASIC for Z80-based CP/M™; computers (CP/M version 2.2 or later); it has been designed to be as compatible as possible with Version 4 of the 6502 BBC BASIC resident in the BBC Micro Master series.
		BBC BASIC (Z80) is available in four versions: a 'generic' CP/M version, a special version for the Amstrad Colour Computers (CPC464, CPC664 and CPC6128), a special version for the Tatung Einstein and a special version for the Torch Z80 Second Processor.
		BBC BASIC (Z80) occupies about 16 Kbytes of RAM; the rest of the user memory (up to a total of about 48 Kbytes) is available for BASIC program(s), variables (heap) and stack.
	www.cix.co.uk /~rrussell/bbcbasic/z80basic.html (413 words)

	Z80 File Format
		.z80 files are memory snapshots - they contain an image of the contents of the ZX Spectrum memory at a particular instance in time.
		As a result of this, they cannot be used to reproduce the original tape from a snapshot file, but do load almost instantaneously.
		The.z80 format was originally developed by Gerton Lunter for use in his Z80 emulator, and three versions of the format, as saved by Z80 versions 1.45 (and earlier), 2.x and 3.x (and later) are in use.
	www.shadowmagic.org.uk /cssfaq/reference/z80format.htm (1020 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Generating Zilog Z80 style mnemonics from Intel 8080 code is possible because the 8080 has an instruction set that is a compatible binary subset of those of the Z80.
		Not all of the S-100 lines were clearly defined and since the S-100 could be used with a variety of processors including the Intel 8080, Zilog Z-80 and Motorola 6500 and 6800 microprocessors some lines were only generated by certain microprocessors.
		Consequently, Z80 assembler (even if restricted to the 8080 subset) appears quite different even though the resulting binary image is identical.
	www.lycos.com /info/intel-8080--zilog-z80.html (349 words)

	Z80 microprocessors: Rabbit 8-bit Microprocessor Series
		Rabbit Semiconductor's microprocessors share their instruction set with Z80 microprocessors, making it the ideal solution for Z80 microprocessors designers.
		In its first year on the market, an independent survey of OEM designers showed that more engineers were considering the Rabbit 2000 over the Zilog Z80 microprocessors/180 microprocessors, Hitachi H8, and Dallas 80xx/80Cxx.
		While it runs three times faster, the Rabbit shares a similar architecture and a high degree of compatibility with the Z180 / Z80 microprocessors, but with key improvements for superior performance and ease of use.
	www.rabbitsemiconductor.com /etc/Z80_microprocessors.shtml (391 words)

	Zilog Z80 - Wikipedia, the free encyclopedia
		It supplies the base address for a 128-entry table of service routine addresses which are selected via a pointer sent to the CPU during an interrupt acknowledge cycle.
		Other 6502 architecture computers on the market at the time, such as the BBC Micro, Apple II and the 6510 based Commodore 64, could make use of the Z80 with an external unit, a plug-in card, or an expansion cartridge.
		The Stofor message switch, used extensively by banks and brokers in the UK was Z80 based.
	en.wikipedia.org /wiki/Zilog_Z80 (3784 words)

	Some features of the Z80 (Site not responding. Last check: 2007-10-20)
		The Z80 will read the interrupt handler address from the location pointed to by the interrupt handler pointer, and then jump to that address.
		The Interrupt Vector Register (I) The I register is used in Z80 Interrupt Mode 2 to form When it is used in this way, it forms the upper 8-bits of an address which points to the interrupt handler.
		The NMI handler will be executed.When a "RETN" instruction is executed by the Z80, IFF0 is set to the value in IFF1, therefore the maskable interrupt state is restored.
	andercheran.aiind.upv.es /~amstrad/docs/z80.html (1437 words)

	[No title]
		As with the Bbcbasic version for the Einstein, basic interpreters for other Z80 computers could be developed to be loaded into the Einstein from disk or via PC/Einstein communication software.
		Many of the original Z80 8bit computers are decades old and their continuation outside emulation on the PC could depend on rebuilding hardware.
		For a beginner to become a scratch builder of Z80 processing this approach seems attractive as the first modular component built could be accessed and used by the builder.
	members.lycos.co.uk /albertstc01/z80dev/comment.HTM (716 words)

	Z80 Documentation - ticalc.org
		The material covered ranges from calculator-specific to general Z80, and even to assembly in general, so even if you do not own a TI-83 Plus, you will still find the information of use.
		Contains ALL the Z80 instructions, including unsupported ones, along with clock times, sizes, flags affected, hex op-codes, names, and notes for all instructions in an easy-to-read spreadsheet format.
		The material was written in a way that it can be used for ANY Z80 calculator or computer.
	www.ticalc.org /pub/text/z80 (1273 words)

	Z80 Number Cruncher (Site not responding. Last check: 2007-10-20)
		The Z80 was a 8-bit CPU presented by Zilog in 1976.
		In the Z80 the overflow and parity flag are the same.
		In Z80 assembler programming it was common to have parameter passing in registers - something that the C compiler did learn, too.
	home.arcor.de /andreadrian/oldcpu/Z80_number_cruncher.html (2924 words)

	Zilog Z80 - Wikipedia, la enciclopedia libre
		Zilog Z80 A. Un Z80 en encapsulado LQFP.
		El Zilog Z80 (Z80) es un microprocesador de 8 bits cuya arquitectura se encuentra a medio camino entre la organización de acumulador y de registros de propósito general.
		Variedades del Z80 fabricadas actualmente por Zilog (en inglés).
	es.wikipedia.org /wiki/Z80 (1496 words)

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