Sinclair C5 the event they did not, the project could not continue, due to thermal problems. Neither the C10 nor the C15 ever left the drawing board. Although Sinclair went on to produce more (but much smaller) electric vehicles, the C5 debacle did lasting damage to the reputation of subsequent EVs in the UK, which the media routinely compared to the C5. It was not until a highly regarded manufacturer, Toyota, launched a serious and well-received vehicle in the 1990s, the Prius, that the C5 "jinx" was finally laid to rest. In 2017 Sir Clive's nephew Grant Sinclair presented what he called
Sinclair Sovereign and information could only be taken from the memory onto the screen. Five keys were used for memory operations. The Sovereign used a Mostek MK50321N main integrated circuit, the same as the Sinclair Wrist Calculator and some variants of the Sinclair Cambridge. Clive Sinclair had assumed that people would prefer attractive illuminated LED displays to LCD displays, which incidentally also required more expensive CMOS chips. However, his calculators were designed with the assumption they would be turned off between calculations, which did not prove to be the case. Advertisements suggested that the batteries would last "about a year" under normal