Sinclair ZX81 BASIC Programming

Sinclair ZX81 BASIC Programming

Sinclair ZX81 BASIC Programming by Steven Vickers Second Edition 1981 Copyright 1980 Sinclair Research Limited Reproduced with permission from the publisher Converted to HTML by Robin Stuart.


The ZX81 was a home computer produced by Sinclair Research and manufactured in Scotland by Timex Corporation. It was launched in the United Kingdom in March 1981 as the successor to Sinclair’s ZX80 and was designed to be a low-cost introduction to home computing for the general public.

The ZX81 was designed to be small, simple, and above all cheap, using as few components as possible to keep the cost down. Video output was to a television set rather than a dedicated monitor. Programs and data were loaded and saved onto audio tape cassettes. It had only four silicon chips on board and a mere 1 kB of memory.

Table of Contents

  • Setting up the ZX81
  • Telling the computer what to do
  • A History lesson
  • The Sinclair ZX81 as a pocket calculator
  • Functions, Variables, Strings, IF..
  • Computer programming
  • The character set
  • Looping, SLOW & FAST, Subroutines
  • Making your programs work
  • Tape storage, Printing with frills
  • Graphics, Time & motion
  • The ZX81 Printer
  • Substrings, Arrays
  • When the computer gets full
  • Counting on your fingers
  • How the computer works
  • Using machine code
  • Organization of memory
  • System variables

Book Details

Author(s): Steven Vickers
Publisher: Sinclair Research
Format(s): HTML
Link: Download or read online.

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