The Sinclair has been particularly popular in England, where Mr. Clive Sinclair was also born. He wanted to make the machine as cheap as possible, which was successful with the ZX80 and ZX81. However, the ZX81's keyboard was not sufficient, so the Spectrum soon followed.
All Sinclair machines are based on a Zilog Z80.
Shortly after the 128 was released, Sinclair was taken over by Amstrad.