Electronics Today International

Sales have been at 1000 units a day and world-wide sales in October are reported at 40,000. Gladstone Electronics, who import the ZX81 direct from Britain placed the first order from North America but still have an enormous backlog of orders.

Interface binary-coded decimal (BCD) devices to the ZX81.

Circuit modification to improve reliability of SAVEs.

A consortium of North American companies has come to gether to publish the first monthly magazine aimed solely at the 700,000 users of the TS1000 and ZX81. In what is one of the largest magazine launches into the home computer market, Timex Sinclair User will have an initial print run of 100,000.

Spectrum announcement. Sinclair has also come to an agreement recently with Timex to distribute the computers in North America; the two companies have been in close alliance for some time as the ZX81 and Spectrum are both manufactured in Timex’s Scottish plant.

Connect a ZX81 to servos.

Review of the ZX81.

Battery backup power supply for ZX81.

Hardware and software to interface a ZX81 to an oscilloscope or other vector display and draw draphics.

Four programs: trigonometric Fourier synthesis, program labels, dodge game, rapid descent.

Fast eight-bit analog to digital converter project.

Input/output interface board that works with either ZX81 or Spectrum.

The ins and outs of Sinclair computers. Details are given for the Spectrum as well as the ZX81.

A complete, ready-to-run computer for under $350 would make anyone sit up and take notice.

Circuit to invert ZX81 video signal, provides white on black.

Simple alternatives to hardware modifications for loading/saving problems on the ZX81.

Update on accessories, software, a BASIC program, notes on the Spectrum, KRAKIT, fast load software, and a machine language program.

Small circuit to allow internal RAM to be used for user-defined graphics when the computer has 16K RAM pack attached.