There's already a huge number of books around for the Electron, but where are the Electrons?

21 Games is a well-presented book of graphics games from these well-known authors. They point out at the beginning that it is 'not intended as just another collection of programs', but it can be used 'to further improve your own knowledge of Acorn BASIC programming'. I would go along with their comments.

The games cover a broad spectrum with offerings such as Word Scrabble, Positron Invaders, Capture The Quark, Electron Epsom and Fruit Machine.

Each program is treated in similar vein. First, a black-and-white photograph shows the display you can expect to see on running it. A general introduction is followed by details of 'How to Play', outlining the responses required from the player. 'Typing Tips' points out where keying-in errors are likely to occur. A program's structure is analysed and attention drawn to the main subroutine areas. In many instances, the programming details are followed by a section on 'Scope for Alteration'.

The listings are dot-matrix reproductions but remain legible and they are also sensibly laid out, being split across pages at procedural boundaries. They are also kept to sensible lengths.

A commendable production.

Bruce Smith