 Clive Sinclair wanted to design a calculator to compete with the HP-35 using this series of chips.Despite scepticism about the feasibility of the project from Texas Instruments engineers, Nigel Searle was able to design algorithms that sacrificed some speed and accuracy in order to implement scientific functions on the TMS0805 variation.The Sinclair Scientific first appeared in a case derived from that of the Sinclair Cambridge, but it was not part of the same range.