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I received an interesting Macintosh disk from Anthony J. Oresteen, 50518. 452 Orion Rd., Batavia, IL. On it was some software which included a program to convert Sinclair ZX 81 BASIC files (tokens) to ASCII files.article, orig pub: 07.12.26, updated: 07.12.26

A few years ago I had trouble understanding why hams were putting computers in their shacks. The darn things made a lot of noise and as far as I could see didn’t have a thing to do with radio communications. Then an article in ORBIT magazine offered to help me plot satellite orbits and with…article, orig pub: 07.12.26, updated: 07.12.26

As you has seen in article published under title “TURN OR NOT TURN?” that is an automatic antenna rotator controller designed to interface between the TS-1000 and virtually all rotators. Now, if you are interested in a system with two rotator for use in satellite tracker will control both an azimuth (360°) and an elevation…article, orig pub: 07.12.26, updated: 07.12.26

As you has seen in article published under title “TURN OR NOT TURN?” that is an automatic antenna rotator controller designed to interface between the TS-1000 and virtually all rotators. Now, if you are interested in a system with two rotator for use in satellite tracker will control both an azimuth (360°) and an elevation…article, orig pub: 07.12.26, updated: 07.12.26

The short program at the end of this article can be used to test the RAM of you ZX81 type Sinclair computer. It does a quite thorough check of all the RAM installed in your system except for that being used by the program. Of course if the program is running correctly that by itself…article, orig pub: 07.12.26, updated: 07.12.26

Over 200 pages of educational material, written to be used as a self-teaching course in beginning machine code. Many examples and tips.book, orig pub: 04.05.20, updated: 03.13.26

Subtitle: The only book you’ll ever need to become an expert at the Timex/Sinclair 1000 and 2000book, orig pub: 04.05.20, updated: 03.13.26

Practical programs to do real jobs in a variety of environments. Included is a bulk storage program, word processing, financial applications, banking uses, plus educational programs. Author pushes the ZX81 and casts aside the idea that it is too small for any real computing work.book, orig pub: 04.05.20, updated: 03.13.26

Subroutines for applied math and plotting routines, for both TS 1000 and TS 2068. Available with cassette.book, orig pub: 10.18.20, updated: 02.15.26

30 games ranging from fortune telling programs to simulation of the ecosystem.book, orig pub: 04.05.20, updated: 01.24.26

While the Timex Corporation is best known for its watches, it also produced a number of other products since its inception as a clock company in the mid-1800s. During World War II, the company produced fuse timers for defense products, continuing through the 1950s and the Korean war. After the Korean war ended, Timex expanded…company, orig pub: 06.19.19, updated: 04.30.26

Dial in any four-band resistor's color code with this interactive decoder that calculates resistance, preferred E12 values, and tolerance in real time.computer_media, orig pub: 06.02.24, updated: 07.06.26

A machine code screen utility that lets you highlight any rectangular display region with new attributes while saving the originals for instant restoration via two USR calls.computer_media, orig pub: 07.15.23, updated: 06.28.26

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

WHAT LENGTH IS MY TAPE? Underneath the “0” in Entrepo you will find a small number indicating the tape length. CAN I SAVE MORE THAN 9 FILES? Yes. If you look at page 241 of the Timex 2068 Personal Color Computer User Manual you will find a list of the character set. The next character…document, orig pub: 06.04.24, updated: 07.13.26

Multi-piece mailer from Thomas B. Woods (Jefferson, NH), postmarked April 1984, sent in response to a customer inquiry. Opens with a cover letter reacting to Timex’s exit from the personal computer market and announcing PRO/FILE 2068, shipped early with abbreviated instructions ahead of its full 100-page manual. A detailed PRO/FILE 2068 product sheet follows, describing…document, orig pub: 07.13.26, updated: 07.13.26

Product flyer from Research Service Labs of Oklahoma City, mailed in response to a Radio-Electronics reader inquiry (per the attached mailing label, dated 11/01/84). Cover letter from David A. Schultz, Marketing, introduces a hardware/software line built around expandability: user-selectable addressing and on-board regulation across all boards. Hardware includes an EPROMMER ($75), a Centronics printer interface…document, orig pub: 07.12.26, updated: 07.13.26

Program booklet for the 1986 Midwest Timex Sinclair Computer Fest, held in Cincinnati and sponsored by TS Horizons. Covers a two-day schedule of user-led sessions: word processors, machine language, music programs, modems/telecom (Randy Gordon), CP/M on the TS2068 (Jerry Champkis, of AERCO), a TS clubs round table, ZX81/TS1000 applications (Mark Fendrick), the Sinclair QL, computer…document, orig pub: 07.13.26, updated: 07.13.26

Product brochure for Secondbase’s stick-on push-button keyboard overlay for the TS1000/ZX81, designed to solve the flat membrane keyboard’s lack of tactile feedback. Made of silicone rubber with a claimed 3.5-million-keystroke lifespan, heat/cold/moisture resistance, and no soldering or disassembly required for installation — it simply adheres over the existing flat keyboard. Priced at $15.00, with a…document, orig pub: 07.12.26, updated: 07.12.26

User Groups Vendorsevent, orig pub: 02.14.23, updated: 03.12.26

Vendorsevent, orig pub: 11.27.25, updated: 11.27.25

Fourth annual event. Held at the Hara Arena in Dayton, Ohio on August 28th and 29th. Tim Swenson hosted the first of several after-fest BBQs at his house in Dayton this year. Several of the attendees appear in the photos below.event, orig pub: 03.30.23, updated: 02.24.24

Organized by Tim Swenson, the West Coast Sinclair Show was held in Union City, CA, on 5 June 1999, one week after the East Coast Sinclair Show. Vendors The key visitor to the show was the renowned author Stan Kelly-Bootle, writer of many computer books, including the “Devil’s DP Dictionary”, and the holder of the…event, orig pub: 07.04.21, updated: 07.10.23

Newsletter for people with a combined interest in amateur radio and the Sinclair—Timex computers.periodical, orig pub: 12.11.19, updated: 07.12.26

British publication dedicated to Sinclair computers, most specifically the ZX Spectrum.periodical, orig pub: 12.11.19, updated: 06.11.26

Quarterly published by Tom Woods. Started as Pro/file Updates for owners of ZX Pro/File database. In 1986, the newsletter was renamed to Computer Updates and expanded to include updates to all software published by Tom Woods.periodical, orig pub: 10.11.25, updated: 06.06.26

Quarterly published by Tom Woods. Provided updates and more to owners of ZX Pro/File databasesperiodical, orig pub: 06.05.22, updated: 06.06.26

Newsletter of the Greater Cleveland Sinclair Users Group.periodical, orig pub: 07.10.22, updated: 03.13.26

Plugs into expansion port; beeps when a character is accepted by the computer’s keyboard input routine. Expansion connector allows other devices to be connected. Beep can be triggered from Basic.product, orig pub: 11.30.19, updated: 07.12.26

COMPCBL consists of an adaptor from the back of the computer to a standard 50-pin socket connector, and a ribbon cable assembly ending in a standard 50-pin card edge connector. It is available with 6″ and 18″ cables.product, orig pub: 07.12.26, updated: 07.12.26

PRTRCBL connects from PRTIF to a printer with a Centronics style interface. Available in, 5, 10 and 15 foot lengths.product, orig pub: 07.12.26, updated: 07.12.26

BUFCBL connects between BUF2 and multiple I/O boards. Available with connectors for 2, 4, and 8 boards (ports).product, orig pub: 07.12.26, updated: 07.12.26

BUF2 eliminates excessive loading of computer’s bus by buffering all bus signals (40 lines). Also included is a cable terminator. FEATURES:product, orig pub: 07.12.26, updated: 07.12.26

This informal group has twice a month meetings online (via Zoom). Like in-person user group meetings, we have guests, talk about our projects and a wide array of computing topics. This group has its origins in the Yahoo TS 2068 Group, which migrated to groups.io when Yahoo Groups shut down. Join Our Email List Sign…usergroup, orig pub: 04.21.23, updated: 06.14.26

President: Frank DavisVice-President: Paul HolmgrenSecretary: Willie JonesTreasurer: Carol Davisusergroup, orig pub: 02.01.20, updated: 03.29.26

President: Michael E. CarverVice-President: Bill DunlopSecretary: Jack ArmstrongTreasurer: Rod GowenLibrarian: Gaylen Benchusergroup, orig pub: 02.01.20, updated: 03.13.26

Presidents: Neal Schultz, Bill HeberleinVice President: Bill Heberlein, Neal SchultzSecretary: Lloyd Dreger, Bud DankertTreasurer: Judy Frohboese, Dick CulticeDirector of Education: Dick Culticeusergroup, orig pub: 02.01.20, updated: 03.12.26

The Timex 2000, which was to be the U.S. release of the Sinclair Spectrum, was never released. Instead, the company released the Timex 2068, which had additional features. Carl Miles is using two computers called the Czerweny CZ 1500 and CZ 2000 that were released in Argentina in about 1985 to make a computer that…video, orig pub: 07.07.26, updated: 07.07.26

This music player for the TS2068 reads ProTracker 2 / Vortex Tracker II songs and plays them through the onboard AY-3-8912.video, orig pub: 05.17.26, updated: 07.05.26

Two newcomers join: Charlie Day, who bankrolled a Sinclair QL writing BASIC as a teen, and David Laffineuse, a Florida collector of 80 machines who fried a 2068 with a DivMMC.video, orig pub: 07.05.26, updated: 07.05.26

David's Claude-built "Defender meets Choplifter" runs in Timex 8×1 color, a drop-in SCLD replacement is in the works, an AI indexed 109 meetings and 13,000 emails — plus Bill Miller's giant plastic "control center."video, orig pub: 07.05.26, updated: 07.05.26

Fort Worth user group history, semiconductor fab war stories, the 2060 expansion board project, a Baudot telegraph keyboard interface, Joust for the ZX81, and a rescued tape.video, orig pub: 05.17.26, updated: 05.17.26