Page "ZX Spectrum" Paragraph 19

Sinclair developed the ZX Spectrum 128 ( code-named Derby ) in conjunction with their Spanish distributor Investrónica.

Investrónica had helped adapt the ZX Spectrum + to the Spanish market after the Spanish government introduced a special tax on all computers with 64 kB RAM or less, and a law which obliged all computers sold in Spain to support the Spanish alphabet and show messages in Spanish.