Two of Sinclair's last calculators,
named diplomatically after Sinclair Radionics'
government backers, the National Enterprise
Board. They were launched in October 1977 and
July 1978 respectively, and were amongst the last
generation of calculators with red LED displays.
They faced stiff competition from cheaper and
less power-hungry Japanese LCD calculators which
before long killed the LED calculator market. The
Enterprise Programmable was Sinclair's last stab
at an innovative calculator but by 1978 both
models were being sold at a loss.