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	Sinclair ZX81 - Wikipedia, the free encyclopedia
		Sinclair's reputation for poor quality control was due less to the existence of the bug in some machines, and more to the time it took to react once the bug had been reported.
		The ZX81 sold in large numbers, until it was replaced by its greatly upgraded successor, the ZX Spectrum.
		The Sinclair ZX81 was sold in the U.S. by Sinclair itself (from its facility in Nashua, New Hampshire) and also by Timex as the Timex-Sinclair TS1000.
	en.wikipedia.org /wiki/Sinclair_ZX81 (2790 words)

	Timex Sinclair 1000 - Wikipedia, the free encyclopedia
		The Timex Sinclair 1000 (TS1000) was the first computer produced by Timex Sinclair, a joint-venture between Timex Corporation and Sinclair Research.
		The TS1000 was a slightly modified Sinclair ZX81 with an NTSC RF modulator instead of a UK PAL device and the onboard RAM doubled to two kilobytes.
		It was followed by an improved version, the Timex Sinclair 1500.
	en.wikipedia.org /wiki/Timex_Sinclair_1000 (243 words)

	Sinclair ZX81 - InfoSearchPoint.com (Site not responding. Last check: 2007-10-03)
		The Sinclair ZX81 home computer, released by Sinclair Research in 1981, was the followup to the company's ZX80.
		A printer was marketed to accompany the ZX81: This was a thermal printer in which a wire point sparked the dot pattern into 4-inch-wide silvery-grey thermal paper, accompanied by a distinct odor of ozone.
		The ZX81 improved on this, so that the ZX81 could run in fast mode like the ZX80, blanking while programs ran, or the slow mode (approximately 1/4 as fast) in which the video refresh was maintained while programs ran in whatever spare machine cycles remained (hence the slow-down in program speed).
	www.infosearchpoint.com /display/ZX81 (571 words)

	RWAP Services (Supporters of the Sinclair QL, Spectrum, ZX81, ZX80 and Cambridge Z88).
		The Sinclair ZX81 was the first popular home computer - it followed on the heels of the white Sinclair ZX80 home computer (which was supplied as a kit) and came either as a kit or ready-assembled.
		The Sinclair ZX81 was the first computer to adopt the Sinclair fl colour and originally came with a 700mA PSU, which had the plug incorporated into the power supply unit (akin to the earlier ZX80 PSU).
		However, when Sinclair released its own add-on thermal printer for the Sinclair ZX80, ZX81 and Spectrum computers, it was found that this power supply was insufficient and the larger 1.2A PSU was released for use with the ZX81 (this power supply unit appears half-way along the cable).
	www.rwapsoftware.co.uk /zx812.html (476 words)

	Sinclair ZX-81 computer
		Compared to the ZX80, the ZX81 was much cheaper, at only $99.95, the first computer for under $100.
		The ZX81 has the same microprocessor and runs at the same speed as the ZX80, but it has a better BASIC programming language and is cheaper to produce, due to having fewer chips and a simpler design.
		The Sinclair ZX81 is such a slow and difficult to use computer, many people found that it works better as a door-stop than as a computer...
	oldcomputers.net /zx81.html (557 words)

	Planet Sinclair: Computers: ZX81
		The ZX81 could not have succeeded in the way that it did without the fortuitous involvement of the British newspaper chain W.H. Smith.
		The ZX81 was actually manufactured by an American company, Timex Inc., operating from its factory in Dundee, Scotland.
		From the outset it was clear that Timex was the ideal partner for Sinclair to use in its attempt to crack the crucial United States market.
	www.nvg.ntnu.no /sinclair/computers/zx81/zx81.htm (472 words)

	Planet Sinclair: Computers: ZX80: Articles: PCW 4/80
		Clive Sinclair tells me that he plans to up production to 10,000 units per month starting in April and that he'll be producing 10,000 ZX80s to satisfy overseas demand, so, providing that 10,000 or fewer of you order the new machine per month, delivery should be swift.
		Expansion possibilities for the ZX81 are limited at the moment to the printer and the 16k RAM pack.
		I asked Clive Sinclair if there was any chance of disks being developed and he gave the same enigmatic answer he gave a year ago when I asked the same question about the ZX80: 'We're working on it.' Draw your own conclusions.
	www.nvg.ntnu.no /sinclair/computers/zx81/zx81_pcw0681.htm (3610 words)

	SINCLAIR ZX81 - cheap but good
		It was clear that the ZX80 was the mother of the ZX81.
		In the FAST-mode the ZX81 still had the same flaw as the ZX80, but in the SLOW-mode the CPU could divert it's attention between the output to the screen and other activities.
		The reduction was possible because the ZX81 had and Ferranti ULA-chip, that took care for all in- and output.
	computermuseum.50megs.com /brands/zx81.htm (706 words)

	Mirago : Computers: Systems: Sinclair: ZX81
		ZX81 - Planet Sinclair - Information, photos and resources for the Sinclair ZX80, including a detailed account of its development extracted from Ian Adamson and Richard Kennedy's book "Sinclair and the Sunrise Technology".
		ZX81 kit - UK based sales and support of ZX81 computers in kit form, also related peripherals and books.
		ZX81 Virtual Community - Contains links, a scanned copy of the ZX81 manual as well as ZXTAPE, a DOS-based utility to transfer ZX81 software from a PC to a ZX81 or tape recorder, and to transfer ZX81 software from tape back to PC.
	mirago.com /scripts/dir.aspx?cat=Top/Computers/Systems/Sinclair/ZX81 (471 words)

	Timex/Sinclair ZX81 (Site not responding. Last check: 2007-10-03)
		The ZX-81 was the second in a long series of computers designed by Clive Sinclair, a follow-up of the popular (at least in Europe) ZX-80 computer.
		The first from the rear to front is a standard RCA type plug output from the built in RF modulator to a standard TV.
		Curiously the original mail order units from Sinclair output to a UHF channel not the usual VHF channel 3 or 4 that is seen on most all consumer video products sold in the US.
	www.myoldcomputers.com /museum/comp/zx81.htm (567 words)

	TheWisp.com museum : Sinclair ZX81 (Site not responding. Last check: 2007-10-03)
		Following on from the ZX80, the ZX81 was released in 1981.
		The ZX81 was based on better integrated hardware than the ZX80, and some hardware functions were able to perform independently of the CPU.
		The case of the ZX81 was made from a higher quality injection moulded plastic.
	homepage.ntlworld.com /rp_gamble/museum/zx81.html (129 words)

	::: larwe.com - timex/sinclair 1000 :::
		Sinclair also released a discharge-type printer (it requires metallized thermal paper, and isn't easy to resupply in this day and age), and third parties released various other peripherals.
		For some time, Sinclair had sold the ZX81 in the US via mail-order (ZX81 units sold in the US are labeled slightly differently from the UK edition).
		However, when Sinclair subcontracted their manufacturing to Timex in 1982, the US market "domestic" version of the machine became the Timex-badged TS1000.
	www.larwe.com /museum/ts1000.html (509 words)

	::: larwe.com - sinclair zx81 :::
		Because Sinclair implemented their video output in software, they could and did optimize it for the ZX81's critically tiny memory space - they only allocate the screen as much memory as is required to display whatever text the user wants to see.
		The parcel contained a ZX81 and a 16K RAM pack, and a note saying that since they were no longer the distributors, they were legally unable to sell me a ZX81, but that they had located one behind a dusty filing cabinet and were sending it to me as a gift.
		The ZX81 was also sold in kit form, and there is at least one vendor selling old stock of ZX81 kits.
	www.larwe.com /museum/zx81.html (1369 words)

	Sinclair ZX81 (Site not responding. Last check: 2007-10-03)
		One of the things that made the ZX81 so cheap was the touch-sensitive membrane keyboard.
		There were only 4 chips (in some ZX81 5 chips) working inside: The CPU, ULA (logic chip), 8 KByte rom and 1 KB ram.
		The ZX81 is still far better than a PC for people who want to understand how a computer works.
	www.angelfire.com /me/takis/Zx81.html (227 words)

	ZX81Kit.Com -Sinclair ZX81 Computer Kits Hardware / Software
		Sir Clive Sinclair was, and is one of the UK's great innovators, having created some of the first calculators, LED watches and personal home computers, the first being the Cambridge MK14 microcomputer, the success of which lead to the ZX80 in 1980, available in kit form by mail order from popular electronics hobbyist magazines.
		The ZX81 was also extensively used in schools and colleges for educational purposes, many people working in the computer industry today had their first computer experiences with the ZX81.
		The ZX81 was available in kit and pre-built forms until the Sinclair ZX Spectrum (with hi-resolution colour graphics and sound!) outdated it.
	www.zx81kit.com (360 words)

	Sinclair ZX81
		Sinclair's third computer, the ZX81, was not "just another product" but became a veritable phenomenon.
		By modern standards it is laughably primitive: only 1K of memory, no colour or sound, touch-sensitive keyboard...
		It sold millions, virtually created the British home computer market and made Sinclair a millionaire.
	zxplanet.emuunlim.com /zx81.htm (69 words)

	Sinclair ZX81 - Clive.nl
		Another oddity of the ZX81 was that it echoed the signal from the tape recorder to the screen whilst loading and saving programs using cassettes.
		ZX 16K RAM for Sinclair ZX 80 / ZX 81
		Sinclair ZX Printer for use with ZX81 and ZX Spectrum.
	www.clive.nl /p/sinclair-zx81 (454 words)

	Shopping Resources - ZX81 (Site not responding. Last check: 2007-10-03)
		ZX81 hardware website featuring a project for building your own ZX81 with discrete components as well as Wilf Rigter's ZX97.
		Information, photos and resources for the Sinclair ZX80, including a detailed account of its development extracted from Ian Adamson and Richard Kennedy's book "Sinclair and the Sunrise Technology".
		Contains links, a scanned copy of the ZX81 manual as well as ZXTAPE, a DOS-based utility to transfer ZX81 software from a PC to a ZX81 or tape recorder, and to transfer ZX81 software from tape back to PC.
	ukuk.dyndns.org /directory/661/6619.htm (490 words)

	eBay - sinclair zx81, Vintage Games, Vintage Computing Products items on eBay.com (Site not responding. Last check: 2007-10-03)
		Sinclair ZX81 3D Monster Maze by J. Greye, tested
		Sinclair ZX81 ZX Chess II by Artic, tested
		Sinclair ZX81 All original Sinclair tapes 1 to 5
	search-desc.ebay.com /search/search.dll?query=sinclair+zx81&newu=1&... (418 words)

	Gulliver's Sinclair ZX81 and Spectrum page (Site not responding. Last check: 2007-10-03)
		Sinclair produced a thermal ZX printer, other companies produced compatible dot matirx printers or interfaces to connect it to the office printers of the day.
		Above is the Sinclair ZX Spectrum launched in 1982.
		Although technically superior to the ZX81 it was in some ways less exciting, perhaps because programmers could be less imaginitive with a machine that had more features.
	www.gulliver1.demon.co.uk /sinclair/sinclair.html (466 words)

	onlineinstructions
		These instructions are largely a rehash of the ZX81 instructions supplied by Sinclair Research Ltd. Although Sinclair's instructions are complete, we feel the information is not given in the best format and the best sequence in which it is required when actually assembling your kit.
		So, mostly what we have done is present the same information in a linear fashion, pointing out what you need to know in the order you need to know it.
		Two different brand of connectors have been used by Sinclair and there is an important difference between them.
	www.zx81kit.com /onlineinstructions.htm (2123 words)

	Sinclair
		The Sinclair ZX81 (or Timex/Sinclair TS1000 in USA) is the second computer marketed by Sir Clive Sinclair in the early eighties.
		The Cambridge Z88 was launched in August 1987 by Sir Clive Sinclair under his new company, Cambridge Computers (he was unable to sell it under the Sinclair name, having sold his rights to Amstrad in 1986).
		The SAM Coupe was launched in 1989 by company named Miles Gordon Technology (founded by former Sinclair employees) and was seem by most to be the ideal upgrade from the ZX Spectrum.
	www.geocities.com /SiliconValley/9723/sinclair.html (456 words)

	Pictures of Sinclair ZX81 + accessories (Site not responding. Last check: 2007-10-03)
		The ZX81 had 1 Kbyte RAM, which also held the screen memory.
		Multiface One, an accessory for the ZX81 made by Romantic Robot.
		Multiface One, it had a through-port, so this is it seen from the back.
	m.nu /datorer/zx81-pic.html (88 words)

	Which is better? An Amiga, or a Sinclair ZX81? - English Amiga Board
		The ZX81 was a clear winner early on, with it's thin sloping corner excellent for jamming under doors and stopping them open.
		The Amiga with it's much wider profile, but periously thin plastic, was simply pushed aside by any door with mass greater than the door on a birdcage.
		In the UK, while the Amiga was still ignored, the ZX81 resulted in much sucking of teeth, offers of three places on QUANGOs, and a life membership of Mensa UK.
	eab.abime.net /showthread.php?t=4114 (423 words)

	ZX81 Stuff
		The ZX81 was almost identical to its predecessor, the ZX80.
		The ZX81 had floating-point BASIC in an 8K mask-programmed ROM, and the logic was packed into a single 40-pin chip, a Ferranti ULA.
		The ZX81 had a more advanced display system: it could generate an NMI at TV frame rates to force the CPU to generate the video signal while it was running a program.
	www.howell1964.freeserve.co.uk /ZX81/ZX81.htm (837 words)

	Timex/Sinclair 1000 (Site not responding. Last check: 2007-10-03)
		This relationship with Sinclair led Timex to enter the home computer market with its own version of the ZX81, which was sold through retail stores that already carried other Timex products.
		The T/S 1000 is nearly identical to its ZX81 counterpart.
		T/S 1500, which was a 16K ZX81 repackaged in a Spectrum-like case, and the T/S 2068, which was an enhanced (and somewhat incompatible) version of the Spectrum.
	www.corestack.com /machines/ts1000.html (222 words)

	ZX81 FAQ
		The ZX81 is a small home computer that was quite popular in the early eighties.
		The ZX81 was released in North America as the Timex-Sinclair 1000, and marketed by Timex.
		Unfortunately, the design of the ZX81 made it impossible for the character set to be anywhere in the 16K range, so you couldn't have a user defined set without extra hardware.
	www.honneamise.u-net.com /zx81/zx81faq.html (1709 words)

	Sinclair ZX-81
		In SLOW mode, "the ZX81 will both compute and display simultaneously." In FAST mode, you go 4 times faster, but the display is delayed and jerky.
		This was supposed to be a close-up of the cool add-on keyboard for this particular ZX81.
		Click here to view all comments for the Sinclair ZX-81 and to leave your own.
	obsoletecomputermuseum.org /zx81 (344 words)

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