ZX Computing Issue 1

News
Clive Sinclair to run in Camridge Festival half-marathon

Sinclair and Timex abscent from West Coast Computer Faire in San Francisco

ZX81's bought by more than 2500 schools

Sinclair seal deal with Timex to distribute ZX81 in America

ZX Microfair news

Games
QS Defender, QS Asteroids & QS Invaders by Quicksilva

Other Software
Financial Pack 1, Budget, Critical Path Analysis, Payroll and Stock Control by Hilderbay Ltd

Features
Testing your ZX81's Speed


 * Henry Budgett and Tim Hartnell look at the standard series of benchmark tests and apply them to the ZX81 to see how well it performs.

The Dreaded ROM Bug


 * Frank O'Hara looks at the bug in the original 8k ROM and explains how it occurred.

Building a Library


 * After the first mad programming spree with your machine you may like to build yourself a library of useful programs.

Double your RAM


 * Even if you've never touched a soldering iron before, you should be able to carry out the simple modifications necessary to get some workable RAM space.

First Steps in Machine Code


 * A clever screen-handling routine and the raw ingredients of a Breakout game.

Screen Pokes for ZX80 & ZX81


 * Using POKE to put characters onto the screen is feasible and a potentially useful feature.

Book Review


 * Phil Garratt looks at "Peek, Poke, Byte & Ram", "ZX81 Basic Book", "The ZX81 Pocket Book" and "What Can I Do With 1k?"

DCP Microdevelopment Packs


 * Stephen Adams takes a peek and poke inside this system.

Keyboard Review


 * Tim Hartnell investigates Crofton's Adaptakit.

Quicksilva


 * Tim Hartnell interviews Nick Lambert and reviews Quicksilva's products. The High Resolution Graphics Board, The Sound Board, The Character Generator and the QS Motherboard.

Type-Ins
Windfall by C. Llewellyn

1k Chess by Graham Charlton

Orbit by S. M. King

Currency Converter by Bob Perrigo & Tim Hartnell

ZX-80 Renumber by A. Beasley

Powerboat by Tim Hartnell

Zap by Paul Gausden

Tourist Trap

Micromouse

One Armed Bandit

Othello

Swappo by Tim Hartnell

Area Calculator

Hypno by Tim Johns

Chopper Squad by R. Morland and M. Frobisher

Draughts

Customer File by I Wrigley

UFO by S. Hassen

Sketchpad

Etch-a-sketch