Welcome to TimexSinclair.com, your definitive resource for everything related to the Sinclair and Timex/Sinclair computers in the United States. From the groundbreaking Sinclair ZX81 that brought affordable computing to American homes in 1982, to the Timex/Sinclair 2068, we celebrate these remarkable machines that introduced a generation to the world of programming and digital innovation.

Timex/Sinclair

The American chapter—Timex brought Sinclair’s vision to U.S. homes.

1982

Timex/Sinclair 1000

The U.S. version of the ZX81, available for under $100 at retail stores across America. This machine democratized computing in the United States.

Explore the T/S1000
1983

Timex/Sinclair 1500

Enhanced version of the Timex/Sinclair 1000 with 16K RAM built in, ZX Spectrum style case and keyboard.

Explore the T/S1500
1983

Timex/Sinclair 2068

Color graphics, sound capabilities, and a cartridge port made the 2068 the ultimate U.S. Sinclair experience with serious computing power.

Explore the T/S2068

Sinclair

The pioneering machines from Clive Sinclair that revolutionized home computing.

1980

Sinclair ZX80

The machine that started it all—revolutionary for its price point and brought computing to everyday people.

Explore the ZX80
1981

Sinclair ZX81

The machine that brought computing to the masses. Sold over 1.5 million units worldwide—legendary affordability and hackability made it an icon.

Explore the ZX81
1982

Sinclair ZX Spectrum

The ZX Spectrum brought vibrant color graphics and sound to the home computer market, selling over 5 million units worldwide.

Explore the ZX Spectrum
1984

Sinclair QL

Sinclair’s ambitious 32-bit business computer. Multitasking OS, built-in Microdrives—ahead of its time with professional aspirations.

Explore the QL
1987

Cambridge Z88

Sinclair’s ambitious 32-bit business computer. Multitasking OS, built-in Microdrives—ahead of its time with professional aspirations.

Explore the Z88

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We have a YouTube channel, active email list and more! We meet via Zoom on the first Monday and third Sunday of each month to chat about our favorite computers, projects and more. Each meeting is recorded and posted to YouTube. You can watch some of our most recent meetings below.

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A satellite orbit propagator that applies J2/J3/J4 gravitational perturbation corrections analytically to predict spacecraft position and velocity over time.computer_media, orig pub: 06.27.26, updated: 06.27.26
Converts observed satellite orbital elements to the smoothed mean elements needed by BgORBIT, using an iterative J2/J3/J4 perturbation correction loop that converges to sub-metre accuracy.computer_media, orig pub: 06.27.26, updated: 06.27.26
A least-squares differential corrector that fits mean Keplerian orbital elements to a time series of observations using analytically computed J2 secular partial derivatives and Gauss elimination.computer_media, orig pub: 06.27.26, updated: 06.27.26
About This Paper NASA Technical Paper 2811, published in March 1988, describes a method for predicting the position of an Earth-orbiting satellite using a personal home computer — specifically, the Timex/Sinclair 2068, a machine that cost less than $200, fit on a desktop, and drew about one ampere of power. The author, R. Asa Gordon,…document, orig pub: 06.27.26, updated: 06.27.26
Enclosed are copies of “ctas.Bl” v9.2. If you have sent copies of the previous version to anyone and happen to have a record of who, send me his name and address and I’ll mail him the latest version. Also enclosed is a schematic of ray working version of Bill’s ROM/EXROM bypass board. In case you…article, orig pub: 10.27.20, updated: 06.27.26
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