First released in 1984, the Amstrad CPC (Colour Personal Computer) was a series of six 8-bit computers manufactured by Amstrad. Competing against the Commodore 64 and Sinclair Spectrum, the Amstrad line distinguished itself in European countries such as France, Spain, and Germany. The first three versions, the CPC464, CPC664, and CPC6128, were the most successful, though Amstrad continued the line with three more models until 1990. The main selling point of the series was its "all-in-one" advertising. The computer, keyboard and data storage devices were attached as a single unit, and users had the opportunity to also purchase a dedicated monitor. Other computers of the era sold data devices such as disk drives and cassette players separately, and buyers were instructed to use home television sets as their monitors. Amstrad computers also possessed high resolution graphics and text, making them both a popular business computer and gaming platform. Overall, the CPC series sold approximately three million units.