Last Updated on December 26, 2025 by Dave Farquhar
The Timex Sinclair 1000 was the U.S. version of the Sinclair ZX81. Timex announced it April 20, 1982, and released it in July. It was a real computer for $99 way back in 1982. It sold 500,000 units in 1982, but only 100,000 units in 1983, so it was only on the market for about 18 months.
The Timex Sinclair 1000 sold for $99, and was the first home computer to sell for under $100. It was a very limited machine with 2 KB of RAM, a membrane keyboard, and no color or sound, and was discontinued in 1983.
Introduction
The Timex Sinclair 1000 was a joint venture between Sinclair, Sir Clive Sinclair’s UK-based computer manufacturer, and Timex, best known as a maker of wristwatches. The Timex Sinclair 1000 was an Americanized version of the ZX81. Timex replaced the RF modulator with a version suitable for use in North America, added an additional 1 KB of RAM and added additional shielding, as the FCC was very strict about computer emissions in the early 1980s. It used a household CRT television as a display and a standard cassette recorder for storage.
The ZX81, introduced in March 1981, had been extremely successful in the UK. Timex initially sold a 1K version of the ZX81 under license starting in late 1981, but announced a slightly enhanced model, the Timex Sinclair 1000, on April 20, 1982. Timex introduced it to the market in July 1982, priced at $99, and launched a price war.
Initial success
It’s been largely forgotten over the years, but initially, the Timex Sinclair 1000 was very successful. It sold 500,000 units in 1982 in spite of only being on the market for half the year. Timex struggled to keep up with demand, and they outsold everyone. They didn’t just outsell Commodore, Tandy, and Apple. Timex outsold all three combined. Commodore’s VIC-20 was the best-selling computer of 1982 as a whole, but it was riding on the strength of its first-half sales to do it.
The computer market as a whole was growing fast. In 1982, Time observed computer sales doubled every year from 1980 to 1982.
The problem was Timex couldn’t sustain the success. After selling half a million units in the first six months, the Timex Sinclair 1000 only sold a disappointing 100,000 units in the whole of 1983.
While the British ZX81 did find sustained success, selling 1.5 million units, its US counterpart did not. The other problem for Timex was they didn’t sell enough additional peripherals or first-party software to be profitable. Timex discontinued the TS 1000 in 1983 and exited the US computer market entirely in February 1984, after the TS 1500 and TS 2068 failed.
Demand for computers contributed to the video game crash of 1983, but Timex wasn’t benefiting from it. In November 1983, the average street price of a Timex Sinclair 1000 was half that of the fading Atari 2600 game console, a sign that Timex was feeling more desperate than even Atari. In August 1983, Kmart was selling the Timex-Sinclair 1000 for $29.97.
Technical specifications
The TS1000 had a Zilog Z-80 CPU running at 3.25 MHz, with 2K of RAM and a membrane keyboard. But due to the limited graphics capability, its competitors generally were able to run faster even if they had a slower clock rate, because the CPU had to do all of the work. The lack of color was also a drawback unless the owner was using a black and white TV for display. Owners could expand the RAM to 64K with third party add-ons. However, due to the machine’s architecture, they could only use 56K.
The Timex Sinclair 1500 added more memory and a slightly improved keyboard, but that alone wasn’t enough to save the product line. Sinclair’s handoff from the ZX-81 to the ZX Spectrum in the UK went much more smoothly than Timex’s transition.
Using the Timex Sinclair 1000
The Timex Sinclair 1000 was a bit of a mixed bag. Its graphics capabilities were very limited, but it had a fairly powerful version of Basic for its time, including graphics commands. This made it easier to write simple games on it than on its main competitor, the VIC-20. But its 2 KB of RAM was very limiting and the computer as a whole felt underpowered. The membrane keyboard was hard to type on, and you had to get used to using hotkeys to enter Basic commands when you typed in programs.
Timex sold a 16K RAM expansion module for it, which helped the memory shortage. But the RAM expansion had a problem. The connector wasn’t gold plated and didn’t fit very tightly. It also protruded from the top of the machine, making it easy to bump. If you accidentally bumped the RAM expansion connector, you crashed the machine.
The TS 1000 also had what I consider another serious design flaw. It used the same 3.5mm connector for the power jack as it did for the tape drive, and it placed all three connectors right next to each other. This made it entirely possible to plug the AC adapter into one of the tape leads and send 9 volts DC straight into the ULA, the only proprietary chip on the motherboard.
The Timex Sinclair 1000 power supply
Frequently when a Timex Sinclair 1000 turns up today, the power supply is missing. When the computer went into storage, the AC adapter probably ended up in the box of random AC adapters, where it was eventually reused or discarded.
The Timex Sinclair 1000 needs 9 volts DC, with a 3.5mm connector, with the tip negative. The original power supply was .7 amps, or 700 mA. An Atari 2600 power supply works perfectly, though its 500 mA probably isn’t enough if you use the 16K memory expansion with it. If you want to be safe, look for a 1-amp unit. Of course 700 mA is fine but 1A will be easier to find. Higher voltage is bad, but higher amperage is OK, within reason.
Why the Timex Sinclair 1000 failed in the United States
In spite of quickly selling a half million units, the Timex Sinclair 1000 is generally considered a failure. Why?
Demand for home computers was booming in 1982 and 1983, and Timex was a household name. Furthermore, selling 600,000 units would have meant it was likely the third best-selling computer of its time, behind the Commodore VIC-20 and Texas Instruments TI-99/4A in a crowded market.
So what was the problem?
Stiff competition
Commodore lowered the price on the VIC-20 and TI and Atari followed suit. While the VIC-20 was underpowered and the TI was a good idea poorly implemented, both of them were better machines than the TS 1000. They offered real, full-travel keyboards so you could touch type on them, and they offered color and sound. The Atari 400 was better than both of them except for its lousy membrane keyboard. But all three were much better than the Timex. When the VIC-20 cost $299 and the TI cost $450, there was an argument to buy the Timex and upgrade to one of the others later. When all four machines cost $99, it made sense to skip the upgrade cycle.
Timex lowered its price to $49 to try to compete, but the much larger software library for the other three machines made them worth the money. Worse yet, all the others had an automatic upsell that Timex lacked. While Timex let you use a standard household tape recorder, the competition used their own proprietary connectors. That meant you had to buy their $70 cassette drives instead of letting your household tape recorder do double duty. Atari, Commodore and TI made more money off their tape drives than Timex did off their computer. All of them also offered disk drives if you wanted faster storage.
Better value, better ecosystem
The hidden price of the tape drive really meant a VIC-20, Atari, or TI setup cost $120 more than a Timex setup. But most U.S. consumers were willing to pay that. Then, as now, people were willing to pay a premium for a nicer keyboard and nicer graphics.
In the UK, where Atari, Commodore and TI didn’t have a head start, the ZX81 fared better. But in the States, where all three had a chance to build an ecosystem around their computers, they could afford to sell their machines at break even or even a loss and make up the difference in peripherals and first-party software titles.
Timex promised to offer somewhere between 25 and 30 first-party software titles upon release. But only a fraction of them materialized. This was something of a chicken-and-egg problem. It’s easy to understand Timex being reluctant to go to the expense to import and publish a bunch of software for a computer that wasn’t selling. But one reason it wasn’t selling was because there was more software available for the competition. The competition understood that in order to build a market for their machines, they had to offer some software themselves, at least initially. And the profits from the software helped make up for any losses they incurred in a race to the bottom during a price war.
It’s possible that the initial success confused Timex and made it difficult for them to figure out what to do when sales faltered the next year.
When a sale isn’t a sale
Making matters worse in 1983, many of Timex’s sales that year were a gimmick. In 1983, Commodore offered a $99 rebate toward a Commodore 64 with the trade in of any computer or game console. Discounters advertised the two machines side by side, encouraging consumers to buy both machines, send the Timex to Commodore, and pocket the $50 difference. Commodore ended up with a warehouse full of Timex computers no one wanted. Commodore employees used them as doorstops and sometimes scrounged parts from them late at night. The CPU from the Timex Sinclair 1000 in Bil Herd’s office ended up in the Commodore 128 prototype.
Timex was the loser in that deal. Sure, it sold the machine and made a tiny profit. But it gained no additional mindshare, and no additional sales from peripherals or software. Commodore got played too, but at least it offered the rebate on what was at the time a high-margin machine.
Timex got its chance to play the spoiler, however. Commodore designed its ill-fated Commodore 16 and Plus/4 primarily to compete with low-cost machines from Timex at any price point Timex wanted to hit. Timex left the market and Commodore, in a fit of something other than brilliance, released the machines anyway. This unleashed half a million computers that had nothing to compete with except Commodore’s other very successful machines. This was the first of Commodore’s many missteps that took it from leading the industry in market share to bankruptcy and liquidation in just 10 years.
Lack of successful followup
But I think ultimately the reason so many argue the Timex Sinclair 1000 was a failure was because none of its followups sold well. In the UK, the ZX81 sold 1.5 million units and led to the Sinclair Spectrum, which sold 5 million units. I think we would see the Timex Sinclair 1000 in a different light if the US version of the Spectrum, the Timex Sinclair 2068, sold well.
After all, demand for the Commodore VIC-20 tailed off sharply in 1983 as well. Commodore didn’t care because they sold 3 million C-64s that year. If the 2068 had matched or bettered the 1000’s 1982 sales figures in 1983, we’d talk today about how the 1000 set the stage for its more powerful successor.
Differing attitudes toward computers in the US and UK
I think there was one more factor that made a cheap-as-possible computer more successful in the UK than on the other side of the Atlantic. In 1980, the British government launched a computer literacy project and put the BBC in charge of it. This fostered an interest in computers throughout British society. While the BBC commissioned a computer and most of its content favored that machine, it did try to maintain some platform neutrality. That meant people who couldn’t afford a fancy BBC Micro could buy a cheap Sinclair computer and still do the exercises and learn.
There was no similar cohesive effort in the United States. There was a government program called Chapter 1 to furnish schools with computer equipment, and PBS had a television show called Computer Chronicles. But the interest in computers didn’t permeate all of US society. In the small rural town in Missouri where I lived during the mid 1980s, most people thought my parents were weird for letting me have a computer at home.
Unlike the UK, the people in the United States who could only afford a Timex were the least likely to buy one. Middle-class families were happy to buy a nicer computer at a higher price, or just wait a year or three to see what happened next. I get the sense that in the UK, there was a fear of missing out. That wasn’t prevalent here.
I got mixed reactions when I posed that question online. So maybe the reasons were more complex than that, but for whatever reason, the British ZX81 outsold the Timex-Sinclair 1000 2.5 to 1, in spite of having 1/4 the population of the United States.
A second life and legacy
Timex’s machines did retain a bit of a cult following after Timex left the computer market. The machines were inexpensive, so hobbyists would buy them and use them like we use a Raspberry Pi today, for projects. It had a built in programming language and could use a cheap tape recorder and black and white TV for a display. That made it good for robotics and home automation experiments, or controlling a model railroad. Timex Sinclair 1000s still turn up from time to time in the estates of mad scientist types.
If the machine broke, it wasn’t a huge deal. Replacement units were cheap, and some inventory remained in the sales channel for years. I personally spotted a lonely Timex computer languishing on a shelf at an Osco Drug in central Missouri in 1993. Yes, a decade later.
Furthermore, some of the machines’ weaknesses could be overcome. You could add an additional 16K of RAM to it, making it more useful. And when TI departed the home computer market soon after Timex, TI keyboards turned up in the surplus electronics market. Radio Shack even sold them for a time, with catalog number 277-1017. Timex owners soon figured out how to rewire the cheap surplus TI keyboards to work with their machines. If you ever see a Timex Sinclair 1000 with an external keyboard wired in, compare the keyboard to a TI-99/4A. There’s a good chance it will match.
These developments, along with the ability to run software imported from the UK, helped the machines survive longer than they otherwise would have.
How much is a Timex Sinclair 1000 worth today?
Although the machines are old, the Timex Sinclair 1000 isn’t terribly rare, since it sold about 600,000 units when new. I see people trying to sell boxed examples for $99. But unless it’s complete with all the paperwork and pristine, $50 is much more realistic. A loose example is worth about $20, especially if it’s untested. The keyboards frequently go bad, and replacements cost around $22. They make good curiosity pieces, but nostalgia plays a big part in value. That’s why less rare machines from the era are worth more. More people have memories of owning or using an Apple, Atari, Commodore or TI computer in the 1980s.
That’s not to say it didn’t have a following. Here’s a nice series of articles about a TS1000 owner, Brad Grier, refurbishing his vintage example. His enthusiasm for the machine is clear.
Although a computer approximately four decades old still in its original box sounds unusual, boxed examples of Timex and TI computers are surprisingly common. Back then, any computer, even a $49 Timex, was a major purchase, and purchasers would save their boxes and even the original paperwork. If someone bought either machine and lost interest or upgraded to something else, back in the box it went. If you do find a boxed example, look through the papers inside. You may very well find a dated sales receipt, and possibly even the ad that piqued the original purchaser’s interest.
David Farquhar is a computer security professional, entrepreneur, and author. He has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.
Sinclair had a reputation for developing really innovative products but which weren’t built well, or which had an irritating flaw (here black and white graphics).
I had used a Commodore PET at work and knew the Sinclair machines were poor in comparison. I eventually bought a Vic 20 for myself and instantly regretted it as it was so underpowered, then they bought out the C64 and I felt this even more being stuck with my Vic 20.
The Sinclairs caught that early wave of computing enthusiasm, but were replaced in popular use by the BBC Micro, which you have mentioned in the past. The BBC Micro was part of a computer education project on BBC TV and was really successful. It was developed by Acorn, which now lives on as ARM the developers of the ubiquitous processor corer used in most mobile phones today.
Hi Dave, if you DM me your email id I have a video I can share you might find interesting.
The TS1000 was such a strange little machine. I never used one back in the day but I clearly remember that, for a short time, there was an end cap stack of them on sale for $99 at the local Von’s supermarket (a regional chain) where my family shopped. To be clear, this was not a combo general goods & food store like some current WalMart’s and Target stores. This store sold nothing but groceries and it wasn’t especially large or well-stocked. That was so odd that it struck even teenaged, pre-grizzled computer industry veteran, me as super weird.
Of course today I have a pristine example of every model of UK Sinclair and US Timex Sinclair in my collection, but even back then, the early Sinclairs never caught my interest. As you said, they just didn’t compare well to against any of the $200-$400 competition – and that keyboard… Although the later Sinclairs did get pretty interesting, even before the 68K-based QL. The Spectrum line was decent but they were, unfortunately, only commonly available in the UK so they remained only something interesting to read about in imported magazines at the time.
Adding to my own post, as I hit ‘post’ too quickly.
At the time, I never heard anything about Timex’s computer aspirations or the team leading their erstwhile, short-lived computer efforts – and I’ve never heard anything about it in all the retro history-digging that’s happened since. I mean, in a world where you can learn the pizza preferences of anyone named Tramiel and which model of private jet Irving Gould flew back and forth to the Bahamas, it’s maybe a little odd there’s zero info (to my knowledge) on the people or plan behind Timex’s corporate adventure into computers.
I suspect that may be because, there was no plan and (almost) no people behind it. I think it was an attempt to get in on a “hot” new consumer category by slapping a *vaguely* related but still well-known, old consumer brand on a computer and pushing it through Timex’s distribution channels. In retrospect, what we saw in the market is consistent with that theory. There were a handful of national launch ads, a few follow-up ads in computer trades and mostly co-op marketing funded retailer ads. Co-op marketing is where the manufacturer gives the retailer a partial rebate on their order in exchange for the retailer featuring the product in their ads and/or in-store end caps. This would have been the standard distribution ‘push-through’ playbook back then for the sales force of a mass market brand like Timex. And when the product sell-in didn’t sell-through very well, Timex dropped it like the fleeting cash grab it was.
If other info exists countering this hypothesis, I’d actually be *delighted* to be proven wrong. It would be somehow reassuring to discover there was a small team of product people at Timex who passionately believed in consumer computing and had a plan to sweep the market (no matter how misguided that plan may have been).
coco3 vs c64 who’s wins children love
I saw one Timex in the wild, probably in the mid-80s, and I remember being distinctly unimpressed. I’d had an Atari -bit since 1983, and the Sinclair was comparatively a joke. That’s neat about it being a Ver. 0 Raspberry Pi, though!
Yes, the Timex vs Atari was not a fair fight at all. The Atari 8-bits were amazing machines.
I do wish I’d picked up a TS1000 at some point and maybe I eventually will. It seems like a fun thing to have around, even though I know I’ll rarely use it.