The Sinclair line of computers was not very popular in the U.S. but they did have a presence in the form of a license to Timex. Sync was one magazine dedicated to these computers. The contents of the September 1982 issue includes:
Departments
Letters
SYNC Notes
TRY This
Perceptions - The ZX Parser and the Operations Routines
Hardware Tips - MicroAce Hardware Peculiarities
Sync in the Classroom
List Learning with the ZX81 - A program for memorizing lists
Teaching with the ZX81 - An overview of the British scene
Maps and the ZX80/81 - Rethinking maps and mazes
How Many Blocks - A program for preschoolers
Elimination - Developing math and strategy skills
Arithmetic with a Smile - A tool for elementary math drills
Arithmetic series - Developing math concepts through series
Hardware
Repeat Key Option - Build your own repeat key
Math
Degrees, Grads, and Radians - Conversion programs
Rounding Off and Conditional Tests - Pythagorean triples
Machine Langauge
Block Transfers - Machine language programming technique
Games
Chase - Pit your survival skills against the robot warriors
Space Taxi - To the Spaceport, fast
House of Horrors - One for Halloween
Mouthful - Random wit and wisdom for your next party
Reviews
The Complete Sinclair ZX81 Basic Course - Book review