Easy Add-On Projects For Spectrum, ZX81 And Ace by Owen Bishop is one of those little pocket-size books by Babani Publishing that I have often raved about in this column.

Like the rest, this one is packed from cover to cover with really useful information, presented in a fashion that is enjoyable to read and not too demanding. The aim of the book is to extend your micro - Spectrum, ZX81 and Ace, each is catered for equally well - beyond the level of running games programs to a small real-time computer unit with practical applications. Each project covers the building of peripheral apparatus, interfacing, application programs - each is well explained and all the projects, 'Lightpen' to 'Rain Detector' should be within the grasp of anyone who has mastered Basic programming.

Easy Add-On Projects For Spectrum, ZX81 And Ace is a 180 page reader of computer applications. It is published by Bernard Babani and costs £2.75. IBSN 85934 099 6