The search engine’s retro-style doodle features St George on a rearing white horse attacking a green and yellow dragon – a scene recreated in the ZX’s 8-bit style graphics.
The top right-hand corner of the doodle features the same four colour stripes that cut across the right-hand corner of the Spectrum.
The ZX Spectrum was released in 1982 and priced at £175 for a 48KB machine or £125 for the 16kb model. The British computer succeeded Sir Clive Sinclair’s Sir bestselling ZX81.
The first computer made primarily for use in the home, the Spectrum quickly became famous for its sleek Bauhaus-inspired design, distinctive rubber keys, high resolution graphics and colour.
For many people in the early 1980s, especially, those in the UK, the hugely influential computer would have been their first experience of computing and games.
It could perform word processing and database programmes. Games, such as Manic Miner, Boulder Dash and Jet Set Willy, were immensely successful.
Much more advanced models, such as the Commodore 64, followed the Spectrum, but it preserved a loyal following and went on to offer 23,000 software titles made for it.
The Spectrum was officially discontinued in 1992, but PCs, Apple Macs and mobile devices continue to play many games for the machine via retro gaming apps and programmes.