| 14994 | I/F Centronics | ZX-Spectrum 48K | Spanish |
| 34332 | IBM File Viewer | Pentagon 128 | Russian |
| 34333 | IBM Format | Pentagon 128 | Russian |
| 20886 | Infoload | ZX-Spectrum 48K | English |
| 43453 | Input | ZX-Spectrum 48K | German |
| 14733 | Interface III Printer Interface Tape | ZX-Spectrum 48K | English |
| 4000140 | Interface RS232 | Timex Tx2068 | English |
| 25400 | Interface RS232 | ZX-Spectrum 48K | English |
| 21484 | Intime | ZX-Spectrum 48K | English |
| 12521 | Investronica Lapiz Optico | ZX-Spectrum 48K | Spanish |
| 22404 | Jargonaut | ZX-Spectrum 48K | English |
| 20292 | Joystick Adaptor Tape 1 | ZX-Spectrum 16K | English |
| 21951 | Kaycat | ZX-Spectrum 48K | English |
| 15071 | Kempston Centronics Interface S | ZX-Spectrum 16K | English |
| 24502 | Kempston Joystick Conversion Tape | ZX-Spectrum 48K | English |
| 14620 | Kempston Mouse Interface Driver | ZX-Spectrum 48K | English |
| 25816 | Keypad Interrupt Routine | ZX-Spectrum 128K | English |
| 4000106 | Keyword | Timex Tx2068 | English |
| 44130 | Koepfchen | ZX-Spectrum 16K/48K | German |
| 23901 | Konix Liberator | ZX-Spectrum 48K | English |