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Unravel the mystery of Simultaneous Linear Equations, understand their practical applications, and see how these mathematical systems can unlock everyday puzzles.article, orig pub: 08.11.25, updated: 08.11.25

Unleash the power of grey graphics characters for data plotting, with the same vertical resolution as PLOT commands. Discover how to plot in two shades, creating striking visual effects on a dark background.article, orig pub: 08.09.25, updated: 08.09.25

This subroutine draws an unbroken line segment between pixel (X1,Y1) and (X2,Y2). It is based on the equation for a straight line, Y=M*X+B where M is the slope and B is the Y-intercept. First the slope is evaluated in line 1020, after making sure that (X2-X1) is non-zero (division by zero is a no-no). If…article, orig pub: 08.09.25, updated: 08.09.25

This program converts between polar notation (magnitude and angle) and rectangular (or “Cartesian”) notation (“X” and “Y” values) of vector quantities and complex numbers. Many scientific calculators have this function, which often proves useful if you deal with vectors or phasors. On the ZX81, this can be accomplished quite easily using the SIN, COS, ArcTaN,…article, orig pub: 08.08.25, updated: 08.08.25

Here’s a neat program that Bill has allowed us to print, hoping that some of you will avail yourselves of his other programs. Drop him a line at the above address for his current product list. This program, like all Soft-way programs, is tightly coded and numbered consecutively. You may wish to re-number using a…article, orig pub: 08.05.25, updated: 08.07.25

Ring bound guide to Who’s Who at Sinclair was given to staff at the company. It gives profiles on the key staff complete with pictures. It was only available to staff.book, orig pub: 08.05.20, updated: 08.07.25

Complete graphics course for the TS/ZX computers. Chapters on the Memotech High Resolution Graphics module. Topics: animation, 3-D plotting, diagonal scrolling, writing and dissecting uneditable programs, machine code short cuts, and more. Program listings.book, orig pub: 08.05.20, updated: 07.31.25

Tutorial on “how to get started”, necessary equipment and software, Timex Sinclair BBS phone numbers and info about each one. Includes the QL. Table of Contentsbook, orig pub: 09.08.20, updated: 03.20.25

Sinclair Research was the most recognizable of a series of names for a company Clive Sinclair started to produce his many inventions. Sinclair Research designed, marketed and sold the MK-14, ZX80, ZX81, ZX Spectrum, QL and a variety of other products. US Employeescompany, orig pub: 06.19.19, updated: 08.07.25

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: 04.15.25

Add to a program to have optional bold characters.computer_media, orig pub: 08.04.24, updated: 07.15.25

This ZIP file contains the programs and code samples from ZXzine issue 1.computer_media, orig pub: 07.11.25, updated: 07.11.25

This ZIP file contains the programs and code samples from ZXzine issue 2.computer_media, orig pub: 07.11.25, updated: 07.11.25

This ZIP file contains the programs and code samples from ZXzine issue 4.computer_media, orig pub: 07.11.25, updated: 07.11.25

This ZIP file contains the programs and code samples from ZXzine issue 5.computer_media, orig pub: 07.11.25, updated: 07.11.25

KRADLE eliminates the major deficiencies of your Timex / Sinclair computer with a full-sized 50 key keyboard, 64K bytes of RAM, a cassette read enhancer, a joystick interface, and other good things in a compact metal case that also holds your fully assembled computer. KRADLE installs easily and requires no computer disassembly. Its low-power design…document, orig pub: 04.02.25, updated: 06.20.25

1.0 Scope This product specification describes the TS2060 Interface Unit, drives, and associated software. The functional, physical, electrical, and environmental characteristics are specified. A description of the operation of the TS2068 system with this unit is included. 2.0 Applicable Documents 3.0 Product Overview The TS2060 Interface Unit provides the electronics, connectors, and firmware to adapt…document, orig pub: 12.26.23, updated: 03.19.25

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

Two day fair in Canada.event, orig pub: 07.04.21, updated: 07.10.23

User Groups Vendorsevent, orig pub: 02.14.23, updated: 07.10.23

User Groups Vendorsevent, orig pub: 02.25.23, updated: 07.10.23

Newsletter of Dallas/Fort Worth area user groups.periodical, orig pub: 05.27.23, updated: 07.24.25

Actively published e-zine, produced with open source software.periodical, orig pub: 11.13.21, updated: 06.02.25

Newsletter of the Clackamas County Area Timex Sinclair Users Group.periodical, orig pub: 12.11.19, updated: 02.09.25

Published by Timothy Swenson. Available online.periodical, orig pub: 10.28.20, updated: 02.01.25

Newsletter of the (Ottawa-Hull) Timex-Sinclair User Group.periodical, orig pub: 06.13.21, updated: 02.01.25

Serial interface compatible with the TS 2050/WC 2050 modem. Includes 25-pin RS-232 connector. Uses Intel 8251 USART, the same chip as in the Timex modem, and supports up to 1200 baud modems and 19,200 baud direct connections. Three versions were available: JLO for use with John Oliger disk systems, AERCO for use with the FD-68…product, orig pub: 11.30.19, updated: 07.27.25

Input/output board with 8 latched outputs (capable of driving an LED, transistor switch or relay) and 8 inputs (switched or TTL level). Can be used alone or with the Computer Continuum buffered expansion bus board for up to 32 simultaneous I/O lines. The RX81 was used in Bruce Taylor’s H.E.N.R.Y. robot, described in Robotics on…product, orig pub: 11.30.19, updated: 07.27.25

Code and edit a source program in the Z80 language and assemble it into machine code. Editor mode allows you to code directly in the right format, manipulate individual lines and control the exact placing of source and machine code. Routines may be merged or listed. Assembler mode handles all standard Z80 mnemonics, numbers in…product, orig pub: 11.30.19, updated: 07.11.25

Cased keyboard with 52 keys, 12 of which are on the number pad. Case measures 15 x 9 x 2 1/2″. Computer fits inside (removed from original case). Comes with motherboard to attach RAM and extend expansion bus to rear edge of case.product, orig pub: 11.30.19, updated: 05.03.25

EPROM demonstrators intended for use in stores as selling tools. EPROM contains a BASIC demonstration program that starts on power up. It includes graphics and interactive examples of what the computer could do. A description of the kiosk retailers could purchase that used this demonstrator is in the Timex Price List 1983. The E. Arthur…product, orig pub: 12.13.20, updated: 04.18.25

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: 08.09.25

Contact: Robert Pearsallusergroup, orig pub: 02.01.20, updated: 05.18.25

In 1988, at the Sunstate Timex/Sinclair Winterfest, a group of enthusiasts proposed a nation-wide user’s group. The name of the group, Sinclair Northamerica Users Group (SNUG), made it clear it intended to include all users in Canada, Mexico and the United States. Mel Nathanson and Mary Lynn Johnson were the initial contacts. The group had…usergroup, orig pub: 06.17.20, updated: 04.07.25

Users living in the area around Tampa Bay. Also known as Timex and Sinclair Bay Area Microcomputer Users Group. Formerly known as SAM BAM (Sinclair and MicroAce Bay Area Microcomputer Users). President: Mel NathansonSecretary: Will BeckerTreasurer: John CushmanEditors: Will Becker, Warren Reed Newsletter: Keyboardsusergroup, orig pub: 10.19.20, updated: 03.29.25

Contact: Peter Wolcott Name changed to Timex/Sinclair Users Group of Kansas City in 1984. Newsletter: Computer Users Group Timex Sinclair 1000 & ZX80/81 Newsletterusergroup, orig pub: 02.01.20, updated: 03.29.25

Discover the ZX81 programming journey of Steven Reid, from his first game 'Water Bug' to the Ultima-inspired 'Gem Quest', pushing hardware limits on his blog, reids4fun.com.video, orig pub: 08.12.25, updated: 08.12.25

This episode covers chronological TS-1500 development boards, March 1983 project management charts, and competing US/Portuguese designs racing toward May launch.video, orig pub: 08.09.25, updated: 08.09.25

This last episode completes a comprehensive documentation analysis, examining October 1983-July 1985 documents revealing continued cost reduction efforts and TS-1500 production extending surprisingly into 1985.video, orig pub: 08.09.25, updated: 08.09.25

This episode examines April 1983 documents revealing Portuguese prototypes failed FCC certification just weeks before May launch, plus marketing strategy targeting extreme low-cost computer market.video, orig pub: 08.09.25, updated: 08.09.25

This episode examines April-May 1983 final launch push, revealing US analysis comparing Portuguese versus Middlebury designs, with Portugal's version having cost advantages but severe technical problems.video, orig pub: 08.09.25, updated: 08.09.25