The Japanese market's favourable reaction to the ZX81 led Mitsui to begin selling the ZX81 over the counter in large bookshops from September 1982, with annual sales of 20,000 units predicted.
A reacción favorable do mercado xaponés ó ZX81 levou Mitsui a comezar as vendas de mostrador en librarías grandes en setembro de 1982, coas vendas anuais previstas de 20 000 unidades.