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Topic: ZX81

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	Planet Sinclair: Computers: ZX81
		The ZX81 owed its success not to its capabilities but to that most elusive quality, being the right product in the right place at the right time.
		The ZX81 could not have succeeded in the way that it did without the fortuitous involvement of the British newspaper chain W.H. Smith.
		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)

	Sinclair ZX81 : ZX81
		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).
		The ZX81 sold in large numbers, until it was replaced by its greatly upgraded successor, the ZX Spectrum.
	www.fastload.org /zx/ZX81.html (564 words)

	Sinclair ZX81 - Art History Online Reference and Guide
		The ZX81 could run in FAST mode like the ZX80, blanking while programs ran, or in SLOW mode (approximately 1/4 as fast) in which the video was maintained since programs ran only while the TV's electron gun moved from the bottom to the screen back to the top.
		The ZX81 used its own non-standard character set in which 0-63 were printable characters and 128-191 were the same characters in reverse video.
		The ZX81 had the bitmaps of the character set at the end of its 8K BASIC ROM; the ROM was wired to the opposite side of address bus series resistors so that certain address bits could be overridden under ULA control.
	www.arthistoryclub.com /art_history/ZX81 (2370 words)

	TheWisp.com museum : Sinclair ZX81 (Site not responding. Last check: 2007-11-07)
		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)

	ZX Interface 2 - New ROM Cartridges
		High resolution ZX81 games utilise a separate display file from the normal one and this must also be copied by the interrupt routine when it is being shown.
		When loading ZX81 programs, the volume control typically needs to be lower than it would for Spectrum tapes and should cause the display to show white and fl bars of equal height.
		As with the 'ZX81' ROM cartridge, when loading or saving via a serial connection a single byte is initially transmitted to indicate the type of transfer required.
	www.fruitcake.plus.com /Sinclair/Interface2/Interface2_RC_New.htm (4873 words)

	ZX81 Main Page: English
		The development work for this ZX81 computer has involved designing and building 5 generations of prototype PCBs of which some combinations didn't work at all and some didn't work to my satisfaction.
		Apparently some of these impedance sensitive circuits are influenced by the extra circuitry in the Euro-ZX81 used to implement the ZX81 SLOW mode feature, in effect to expand the ZX80's display capabilities to match those of the ZX81.
		The final ZX81 prototype which I call the Euro-ZX81 has a horizontal flatcable connector(on the CPU board) which functions as an expansion connector that allows for it to be connected in a larger system which can involve numerous PCBs with different I/O functions.
	www.angelfire.com /ab6/rodneyknaap/zx81_e.html (1063 words)

	ZX81 Home Page! (Site not responding. Last check: 2007-11-07)
		Even though the ZX81 was released behind schedule (in true Sinclair Research style) it was at least a couple of years ahead of it's time.
		The CPU for the ZX81 is a Zilog Z80.
		When I bought my second hand ZX81 it was in working order and I had no problems with it (aparts from the frequent white-outs and the fact that my digital watch probably has more powerful technology).
	www.geocities.com /CapeCanaveral/Hangar/6416/zx81_old.html (529 words)

	ZX81 Computers, Directory (Site not responding. Last check: 2007-11-07)
		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 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.
		Sinclair ZX81 Webring Webring with a main goal of supporting the ZX81 community with information about activities for the computer and its clones.
	www.lovetolive.org /c3Rsb182NjE5.aspx (415 words)

	Directory - CDNet.com (Site not responding. Last check: 2007-11-07)
		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.
	www.cdnet.com /cd/index.cgi?dir=/Computers/Systems/Sinclair/ZX81 (417 words)

	B5 ZX81
		The ZX81 added the refinement of a continuous display by having a non-maskable-interrupt generator to periodially force the CPU to generate a frame of video data.
		The circuit diagrams for the ZX80 and ZX81 are readily available on the net, and it is educational to examine them.
		The original ZX81 had the 8K ROM appearing twice in the first 16K, but only the first 8K image was used.
	www.howell1964.freeserve.co.uk /logic/burched/b5_zx81.htm (1681 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)

	Tiscali - Search
		ZX81 hardware website featuring a project for building your own ZX81 with discrete components as well as Wilf Rigter's ZX97.
		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.
		ZX81 kits, printers, books, RAM for sale (not for US or Canada).
	directory.tiscali.it /Computers/Systems/Sinclair/ZX81 (305 words)

	Sinclair ZX81 - Clive.nl
		The Sinclair ZX81 home computer, released by Sinclair Research in 1981, was the followup to the company's ZX80.
		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.
		Can be fitted on the expansion port at the back of a ZX80 or ZX81 to increase the memory capacity from the standard 1 Kbyte to a massive 16 Kbytes.
	www.clive.nl /p/sinclair-zx81 (454 words)

	ZX81Kit.Com -Sinclair ZX81 Computer Kits Hardware / Software
		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.
		A stock of ZX81 kits, peripherals and components has been held by our associates in the USA since the 1980s, which are now available for sale by us to supply to you here in the UK and all over Europe.
	www.zx81kit.com (360 words)

	Netscape Search Category - ZX81
		Sinclair ZX81 Webring The web ring's main goal is to support the ZX81 fan-community with information about activities for the computer and its clones.
		ZX81 CD Project A project to create a CD intended to play files directly into a Sinclair ZX81 or Sinclair/Timex 1000 via any ordinary soundcard.
		ZX81 realtime server application Describes how to make a clock out of a ZX81.
	search-intl.netscape.com /Computers/Systems/Sinclair/ZX81 (472 words)

	Sinclair User 46 - The Sinclair Story
		Schools could buy a package of a ZX81 and a 16K RAM pack for £60; and he further promised that they would be able to buy the ZX Printer at half price when it was launched.
		A ZX80 Users' Club had been formed before the ZX81 was launched; SYNC Magazine appeared in January 1981 to cater for ZX81 users; Learning Basic with your Sinclair ZX80 by Robin Norman, published by Newnes in early 1981, was one of the first books to develop Basic programming techniques on the home computer.
		The ZX81 had been competing against the Acorn Atom; it could never have stood up against the BBC model A, the current Acorn competitor when the Spectrum came out.
	www.sincuser.co.uk /046/sstory.htm (2641 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 (672 words)

	Pictures of Sinclair ZX81 + accessories (Site not responding. Last check: 2007-11-07)
		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)

	Links: English
		ZX81 software archive, various information and links, follow this link to go to his page.
		I used his ZX81 64K RAM memory manager circuit in my Euro-ZX81 designs, I can say it certainly works very well, as I have used it ever since my first prototype.
		This is a large ftp archive of all sorts of files related to the ZX81, including a very large number of programs for the ZX81.
	www.angelfire.com /ab6/rodneyknaap/links_e.html (451 words)

	::: larwe.com - sinclair zx81 :::
		The ZX81 was a lower-chip-count successor to the ZX80 (a machine I would dearly love to add to my collection).
		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 computers back on sale - ZDNet UK News
		The ZX81 may have difficulties competing with the latest computer hardware, however.
		The Sinclair ZX81 costs $99 (£68 -- roughly the same as they did in 1981) but are sadly not available outside the US.
		I have a ZX81 computer (in the UK) - hardly used - with a brand n...
	news.zdnet.co.uk /hardware/0,39020351,2081817,00.htm (397 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		If you calculate what with the ZX81 in reality is the resolution then you start thinking by yourself why Sinclair for this Computer has forgotten (left out) a high resolution mode.
		Besides color it's very simple to give the ZX81 the same resolution as the Spectrum, all it needs is one little IC and a little program.
		For those of you who don't want to open the ZX81 it is also possible to place this chip inside the 16k Rampack, now it works fine with the normal 16k Sinclair or TS1000 Rampacks I haven't tried other Rampacks yet.
	www.gironet.nl /home/bokse001/Zxmag2.txt (2689 words)

	Amiga vs. ZX81 (Site not responding. Last check: 2007-11-07)
		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.
		Again, a ZX win, though the Amiga was unfortunate in that we did not plan an experiment measuring involuntary vomiting.
		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.
	www.hh.schule.de /hhs/mjaap/zx81_vs_amiga.htm (400 words)

	Sinclair
		ZX81 had a small fl plastic case and was also available as a kit.
		It was of such simple low-cost design that it drove prices of competing computers way down, thus putting computers into the hands of millions of hobbyists and home users.
		T/S1000 looks the same as a ZX81 except it has a Timex/Sinclair logo where the Sinclair logo of the ZX81 appears.
	fms.komkon.org /comp/sys/Sinclair.html (1270 words)

	ZX81 Real-Time Server
		I did contemplate doing the same to my old ZX Spectrum 48K case, but the rubber keys would have got in the way of the hands.
		Now carefully use a screwdriver to fillet the ZX81, and remove the insides, which are now about as useful as the bag of giblets that come out of the Christmas turkey.
		Here we see the ZX81 after being painted, with the hole for the clock mechanism drilled in the front.The masking tape not yet removed.
	www.danturq.net /zx81app (440 words)

	LCD screen for ZX81 (Site not responding. Last check: 2007-11-07)
		Read access of the ZX81 to the Dual-RAM is not needed and does therefore not exist.
		Because the interface is running with 8 MHz CPU clock there is enough time, to access to the Dual-RAM when the ZX81 CPU is in the Refresh cycle.
		Output of a pixelline to the LCD screen is similar to the video of the ZX81: a NMI routine which ends with a JP (HL), where HL is above 8000hex and A15 is high and M1 is low.
	www.zx81.de /english/lcdif.htm (541 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)

	ZX96 - a professional system based on the ZX81 (Site not responding. Last check: 2007-11-07)
		The base of the system is the ZX81 or ZX96 which is enhanced by the Giant-Expansion and the Poke Board.
		It is connected to the internal bus using a Driver Board.
		This unit allows for the connection of a ZX81 compatible matrix keyboard, a monitor and a cassette recorder.
	www.fischerkai.de /zxteam/zx96_e.htm (347 words)

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