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Topic: Z80a

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	Jupiter Ace Resource Site - Z80A chip info
		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.
	www.jupiter-ace.co.uk /acechips_z80.html (702 words)

	Z80A définition Z80A
		Z80A : Il s'agit d'une variante du Z80, très réputée au début des années 80, disposant d'une mesure de vitesse de 4 Mégahertz.
		Z80A définition Z80A, Z80A définiton de Z80A : Il s'agit d'une variante du Z80, très réputée au début des années 80, disposant d'une mesure de vitesse de 4 Mégahertz.
		dictionnaire - dictionnaire en ligne - dictionnaire informatique..., Z80A.
	dictionnaire.phpmyvisites.net /definition-Z80A-9333.htm (316 words)

	World of Spectrum - Documentation - ZX Spectrum +3 - Chapter 8, Part 30
		Hardware The +3 is designed around the Z80A microprocessor, which runs at a speed of 3.5469MHz (about three and half million cycles per second).
		For the contended RAM (which shares time between the video circuitry and the processor), during 128 out of every 228 CPU T states (1 TV line), and during 192 out of every 311 TV lines (1 frame) the CPU is allowed only 1 access to contended RAM in every 8 T states.
		It converts bytes in memory into patterns and colours on the screen, and allows the Z80A to scan the keyboard and read and write data to tape.
	www.worldofspectrum.org /ZXSpectrum128+3Manual/chapter8pt30.html (792 words)

	YouTube - Buying a Z80A CPU Over the counter in 1984
		Join YouTube for a free account, or log in if you are already a member.
		Check out this reporter buying Z80A CPU chip ov...
		This clip is from the same programme we featured previously, 'Database' which was broadcast on ITV in the UK in the 80's
	www.youtube.com /watch?v=r9ZTyiECekQ (758 words)

	Définition de Z80A
		Vous êtes ici : linux-france.org > projets > jargonf > Z > Z80A :
		Articles voisins : YUV < Z < Z3 < Z39.50 < Z80 < Z80A > za > zaoutelouquerie > zapette > Zaxxon > Z-buffer.
		Avez-vous visité le JargonF nouveau et sa définition de Z80A ?
	www.linux-france.org /~rtrique/prj/jargonf/Z/Z80A.html (94 words)

	Hack247.co.uk » Blog Archive » Buying a Z80A CPU Over the counter in 1984
		If you want to find out more about this vintage CPU which was used in the Sinclair Spectrum range of computers then head on over to comp.sys.sinclair’s Z80a CPU FAQ
		This entry was posted on Tuesday, August 22nd, 2006 at 9:59 pm and is filed under Video's.
		DIY USB Shuttle - Homebrew Griffin Powermate »
	www.hack247.co.uk /2006/08/22/buying-a-z80a-cpu-over-the-counter-in-1984 (416 words)

	Magic Computer.
		Here is a machine with both 6502 and Z80A microporcessors, 64K of RAM, dual, double density, double sided disk drives, and detachable keyboard all in a portable package.
		The Z80A can access the main 64K memory, 8K of which is devoted to the operating system and 56K of which is available for user programs.
		Freeing the Z80A from the task of refreshing the video should result in a significant increase in execution speed in many programs.
	www.atarimagazines.com /creative/v10n3/108_Magic_Computer.php (2287 words)

	Bill Haygood (Site not responding. Last check: )
		The Z80A emulator has passed some pretty severe CPU tests which vigorously test ALL the bits of the Flags byte (even the undocumented bits 3 and 5).
		For example, the Z80A instruction: LD BC,1234H has an opcode byte of 01H followed by the bytes 34H and 12H (the Z80A is a little-endian machine).
		The instruction byte (01H) is used to index into the instruction dispatch table which then sends control directly to the 01H instruction emulator function which retrieves the next two bytes, advances the PC and stores the bytes in the emulated B and C registers.
	www.haygood.org /bill/emul/index.html (1903 words)

	MTX500 - Wikipedia, the free encyclopedia
		The Memotech MTX500, MTX512 and RS128 were a series of Zilog Z80A processor-based home computers released by Memotech in 1983 and 1984.
		Although the Z80A could only address a maximum of 64KB at a time, the RS128's extra memory was accessible via assembly language programming via the technique of page switching.
		The computers featured an all-aluminum case and full size keyboard with real keys (unlike others of the same vintage such as the Sinclair ZX Spectrum).
	en.wikipedia.org /wiki/MTX500 (300 words)

	Domes-DOS: Schneider CPC / Geschichte
		1984, Zilog Z80A, 3.3 MHz, 64 KB RAM, 32 KB ROM, Tapedrive
		1984, Zilog Z80A, 3.3 MHz, 72 KB RAM, 32 KB ROM, Tapedrive
		1987, Zilog Z80A, 3.54 MHz, 128 KB RAM, 32 KB ROM, Tapedrive
	www.domes-dos.de /private/cpc/history/history_e.php (454 words)

	Re: z80
		Richard Bosch wrote: >a friend of mine has recently bought a neo geo > >it said on the box that there was a z80a 36000 (or 63000 i don't know >exactly)in it >but my question is wat is the difrence between the z80 in the msx and that >z80a 63000.
		The neogeo has a Z80A and a Motorola 68000 CPU.
		The Z80 in the MSX is a Z80A, that means it can run max.
	www.mail-archive.com /msx@stack.nl/msg02585.html (177 words)

	Untitled Document
		When the Speccy was released in 1982 it was a revolution in the home computing market.
		It has a Z80A processor running at a massive 3.5MHz.
		It is limited to 8 colours, but you could get more by using the BRIGHT command.
	thespeccyzone.emuunlim.com /hardwarefiles/spectrum.htm (664 words)

	Epson QX-10; the friendliest computer around.
		The Z80A CPU operates at a moderate 4MHz clock rate, but it is unable to access a remarkable (for an 8-bit machine) 256K of RAM under Valdocs (only 64K in the CP/M version), 2K of CMOS RAM supported by a backup battery, and up to 8K of ROM housing the basic boot routines.
		Actually, the main unit of the QX-10 has even more memory than is available to the Z80A.
		The keyboard is unconditionally excellent; it ranks with the best units I have handled in terms of stroke, feel, appearance, and arrangement, and the HASCI architecture makes operating the Valdocs system both logical and easy.
	www.atarimagazines.com /creative/v10n6/14_Epson_QX10_the_friendli.php (3235 words)

	The Lil Old ZX Spectrum 48k Service Manual - Section 1
		The architecture of the Spectrum shown above is typical of many microcomputer systems in that it comprises a single microprocessor board (in this instance a Z80A or u780 CPU), a read only memory (ROM), an expandable RAM memory and an input/output section handling the keyboard, tape and TV display functions.
		The latter is recognisable as the logic gate array (ULA) and the three functional blocks shown in the right of the diagram.
		The keyboard matrix is part of the upper case assembly and is connected to the board via two ribbon cables KB1 and KB2.
	www.1000bit.net /support/manuali/zxspectrum/sm/section1.html (3068 words)

	STD202
		The MICRO-LINK STD205 is a powerful, multi-function processor board based on the Z80A CPU and interfaced to the STD Bus.
		In addition to the Z80A CPU, the card features six sockets for EPROM or Static RAM and four programmable counter/timer channels.
		The STD205 utilizes a Z80A microprocessor which functions as the system controller by fetching, decoding and executing instructions in memory and by generating the required signals between the CPU and memory or I/O. The card provides six sockets for RAM or EPROM.
	www.microlinktech.com /std/std205.htm (339 words)

	JohnnyGil's Emulation Page
		For instance, in a ZX Spectrum emulator, a modest computer, with only one major processing component, the Zilog Z80A CPU, the PC actually has to be delayed to get an accurate emulation speed.
		If you try to emulate a Sega Genesis* or SNES, the emulator usually wants as much processing power as possible (the Genesis uses the Z80A too, but only as a sound processor; there are several other chips that need to be emulated).
		Emulating a Sega Saturn or a Sony Playstation is, I believe, impossible for now, due to the huge complexity of these machines, although a couple of Playstation emulators are being developed.
	members.tripod.com /jgil/emulate.htm (1133 words)

	1980-1983
		It features a Zilog Z80A microprocessor, 64KB RAM, 4KB video RAM, cassette-tape recorder, printer interface, dual joystick interface, sound synthesizer, 80x25 text, and dual 5.25-inch floppy drives.
		It features a Zilog Z80A microprocessor, two 3.5-inch drives, and optional Intel 8086 microprocessor add-on unit.
		It features a Zilog Z80A microprocessor, 64KB RAM, 16KB video RAM, CP/M 2.2, 5-inch monochrome monitor, two 600KB 5.25-inch floppy drives, 5-inch thermal printer, and parallel/serial ports.
	library.thinkquest.org /15793/1980-1983.htm (3577 words)

	Z80A pdf datasheet
		The information presented on this site about Z80A is for suggestion purposes only.
		We recommend that you review the Z80A datasheet to confirm the device functionality, pinout, and performance for your application.
		Datasheets.org.uk is not responsible for any incorrect or incomplete information about Z80A.
	www.datasheet.org.uk /pdf/z80a-datasheet/z80a-datasheet.html (71 words)

	Timeline of Microcomputers (1981-1983)
		It features an Intel 8086 microprocessor, Intel 8087 math coprocessor, Zilog Z80A microprocessor, 640x400 graphics, dual floppy drives, and support of various operating systems.
		It features a Zilog Z80A microprocessor, two 3.5-inch drives, and optional Intel 8086 microprocessor add-on unit.
		It features a Zilog Z80A microprocessor, 64KB RAM, 16KB video RAM, CP/M 2.2, 5-inch monochrome monitor, two 600KB 5.25-inch floppy drives, 5-inch thermal printer, and parallel/serial ports.
	nikkicox.tripod.com /comp1981.htm (5298 words)

	JohnnyGil's Emulation Page
		For instance, in a ZX Spectrum emulator, a modest computer, with only one major processing component, the Zilog Z80A CPU, the PC actually has to be delayed to get an accurate emulation speed.
		If you try to emulate a Sega Genesis* or SNES, the emulator usually wants as much processing power as possible (the Genesis uses the Z80A too, but only as a sound processor; there are several other chips that need to be emulated).
		Emulating a Sega Saturn or a Sony Playstation is, I believe, impossible for now, due to the huge complexity of these machines, although a couple of Playstation emulators are being developed.
	www.members.tripod.com /~JGil/emulate.htm (1133 words)

	LNW80 Technical Reference Manual (Site not responding. Last check: )
		CPU ADDRESS LINES The Z80A provides 16 address lines which define the 64K of addressable memory locations.
		Since the Z80A CPU is fully buffered, all the buffers (U3, U4, U5, U17, and U18) will also be tri-stated.
		The LNW80 utilizes the Z80A CPU to generate the refresh to the RAN's.
	www.xs4all.nl /~fjkraan/comp/lnw/trm/trm_II.html (6817 words)

	[No title] (Site not responding. Last check: )
		Their prices were quite reasonable, as were their designs, enabling the old H-8 to use the Z80A and all 64K of address space at 4Mhz.
		The disk controller is an S-100 type, a Jade Double D purchased from Jade Computer Products in California for $60 for the bare board.
		It has an on-board Z80A and uses a WD 179X FDC chip.
	www.retroarchive.org /machines/heath/H8UPGRAD (211 words)

	Pengo High Score Save
		There's a couple of issues, one being the SRAM might not fit into the boards RAM socket very well, in which case a wirewrap socket is required, and the second is a minor pain.....
		If your board is the first variety with the 'custom controller' at location IC2 you will need to replace it with a plain z80A, the 'A' is important and a Z80B or Z80C will also work, or a D780 which is an NEC z80 equivalent.
		the z80a is outline in pink and the ROMs that will need to be replaced in Yellow.
	www.jrok.com /sohs/pengo/pengo.html (434 words)

	Phill's Sinclair Page. (Site not responding. Last check: )
		It was based around the Z80A microprocessor, together with 1K of static RAM and about twenty LS type logic chips.
		It came housed in a white plastic case with a membrain, touch sensitive keyboard.
		Later versions had an enhanced QL like keyboard and built in joystick interfaces.
	home.clara.net /aurigae/sinclair.html (623 words)

	1983-1985
		It features a 4-MHz Zilog Z80A CPU, 64KB RAM, two 5.25-inch floppy drives, and 9-inch B/W screen.
		It features a Zilog Z80A processor, 80KB RAM, 82-key keyboard, 1.25MB floppy drive, and software compatibility with the TRS-80 Model II.
		It features a 4-MHz Zilog Z80A microprocessor, 64KB RAM, two serial ports, 200KB 5.25-inch floppy drive, CP/M v2.2, and separate video terminal.
	library.thinkquest.org /15793/1983-1985.htm (9375 words)

	Classic Computing - Seequa Chameleon Plus
		Weighing in at 28 pounds (12.7 Kg) with dimensions of 8"H x 18" W x 15½" D, it was not exactly ideal for sitting on your lap in an airplane seat.
		The Z80A processor ran at 2.5 MHz allowing you to run CP/M-80 programs.
		I can even still get CP/M software The second processor was an 8088 clocking in at 5 MHz to run IBM PC compatible software.
	www.pibil.org /technology/systems/seequa (296 words)

	Nonowt eZine X - Machine Specifications
		This has the full data, address and control busses from the Z80A, and is used to interface to the ZX Printer, the RS232 and NET interfaces and the ZX Microdrives.
		The expansion port at the rear has full data, address and control buses from the Z80A CPU as well as 0v, +5v, +9v, ± and the memory select lines.
		These signals enable you to interface the ZX81 to the Sinclair 16 Kbyte RAM pack and the ZX Printer.
	www.nonowt.com /magfold/articfol/specific.html (2222 words)

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