Introduction

There are two ways of approaching this set of programs for the Sinclair ZX81 and Spectrum. Firstly, you will find a collection of software which will do real work in a variety of situations. Secondly, programming is much more enjoyable when you understand what is going on and can see how to solve computing problems for yourself. This requires a lot more than a set of listings. Between the sets of listings you will find several chapters which explain the thinking behind the software and the way it is put together. If you follow the second approach to the material you will gain an appreciation of how the ideas and techniques presented here can be built into your own programming and allow you to produce software to a professional standard for your own use.