| 2000429 | Introducing Z-80 Assembly Language Programming | - | English |
| 2000194 | Introducing the Sinclair QL | Sinclair QL | English |
| 28226 | Introduction | ZX-Spectrum 48K | English |
| 28776 | Introduction To Microcomputers | ZX81 16K | English |
| 28775 | Introduction To Microcomputers: End Of Side One | ZX81 16K | English |
| 2001045 | Introduction to Artificial Intelligence | - | English |
| 2000842 | Introduction to Computer Programming for Information Services: TIMEX-SINCLAIR 1000/1500 | - | English |
| 2000198 | Introduction to Computer Programming: BASIC for Beginners | - | English |
| 2000199 | Introduction to Computing | - | English |
| 19802 | Introduction to Economics | ZX-Spectrum 48K | English |
| 2000882 | Introduction to FORTH | - | English |
| 2000608 | Introduction to PASCAL Including UCSD PASCAL | - | English |
| 2000206 | Introduction to Simulation Techniques on the Sinclair QL | Sinclair QL | English |
| 2000207 | Introduction to Superbasic on the Sinclair QL | Sinclair QL | English |
| 10997 | Introduction to Trigonometry | ZX-Spectrum 48K | English |
| 20280 | Introduction to Trigonometry | ZX-Spectrum 48K | English |
| 2000959 | Introduction to Word Processing | - | English |
| 2001425 | Introduction to the Z80 Microcomputer | - | English |
| 18428 | Intruder | ZX-Spectrum 16K | English |
| 6488 | Intruder Alert | ZX-Spectrum 48K | English |