| 17272 | Sir Camelot | ZX-Spectrum 48K | Spanish |
| 22417 | Sir Gawain | ZX-Spectrum 48K | Spanish |
| 6978 | Sir Sigfrid | ZX-Spectrum 48K | Spanish |
| 28146 | Sir Vamperi | ZX-Spectrum 48K | Spanish |
| 16184 | Sirius | ZX-Spectrum 48K | Spanish |
| 4524 | Sirwood | ZX-Spectrum 48K/128K | Spanish |
| 38032 | Sistema Diedrico Ortogonal | ZX-Spectrum 48K | Spanish |
| 19108 | Sistema Experto de Flores de Jardin | ZX-Spectrum 48K | Spanish |
| 19109 | Sistema Experto de Minerales | ZX-Spectrum 48K | Spanish |
| 17867 | Sistema Grafico PIN | ZX-Spectrum 48K | Spanish |
| 42228 | Sistema Periodico | ZX-Spectrum 48K | Spanish |
| 16580 | Sistema Solar | ZX-Spectrum 48K | Spanish |
| 16602 | Sistemas Elementales | ZX-Spectrum 48K | Spanish |
| 16597 | Sistemas No Lineales | ZX-Spectrum 48K | Spanish |
| 16453 | Sistemas de Ecuaciones | ZX-Spectrum 48K | Spanish |
| 37503 | Sistemas de Ecuaciones | ZX-Spectrum 16K/48K | Spanish |
| 16606 | Sistemas de Inecuaciones | ZX-Spectrum 48K | Spanish |
| 28564 | Sistemas de Numeración | ZX81 16K | Spanish |
| 23565 | Sistemas de Rouche-Frobenius | ZX-Spectrum 48K | Spanish |
| 4528 | Sito Pons 500cc Grand Prix | ZX-Spectrum 48K | Spanish |