| 2000477 | How to Program the ZX81 | - | English |
| 2001302 | How to Win at Pac-Man | - | English |
| 2000178 | How to Write ZX Spectrum and Spectrum+ Games Programs | - | English |
| 2000179 | I Wish I Knew ... about the Spectrum and the ZX81 | - | English |
| 2000748 | INES: Urejevalnik Podatkov, Slik in Besedil | - | Slovenian |
| 2001395 | Idea Book, Timex Sinclair 1000 Edition | - | English |
| 2001052 | Ideas for Micro Users | - | English |
| 2001408 | Il Manuale del Sinclair QL | Sinclair QL | Italian |
| 2001424 | Il Mio Primo Libro di BASIC | - | Italian |
| 2000867 | Illustrating BASIC | - | English |
| 2000180 | Illustrating Superbasic on the Sinclair QL | Sinclair QL | English |
| 2001321 | Imparare a Programmare con lo ZX Spectrum | - | Italian |
| 2001409 | Impariamo a Programmare in BASIC con lo ZX80 | ZX80 | Italian |
| 2001027 | In den Schluchten der Bytes | - | German |
| 2000181 | Information Handling for the ZX Spectrum | - | English |
| 2001282 | Information Technology at Work | - | English |
| 2001630 | Informática y Programación: Paso a Paso 1 | - | Spanish |
| 2001639 | Informática y Programación: Paso a Paso 10 | - | Spanish |
| 2001640 | Informática y Programación: Paso a Paso 11 | - | Spanish |
| 2001634 | Informática y Programación: Paso a Paso 12 | - | Spanish |