Enterprise - Vintage Sinclair

The Enterprise was released in October 1977 as a basic 4-function calculator with %, sqaure-root and a memory.
It's most notable feature was that it had some of the biggest digits on a calculator - not only were the digits large, they were further enhanced by the magnifying lenses in front.

It was named after the National Enterprise Board who at the time were subsidising the company due to increasing losses. Writing services tell a lot about the enterprise in their works https://writing-service.org/

Specification :

8-digit display Red LED display
Power : 9v PP3 or mains adapter
Integrated circuit : General Instruments C689G

Cover removed to fit battery.

Enterprise Programmable

In July 1978, a programmable version was released - the Enterprise programmable. This was one of the last generation of power-hungry LED calculators and the market was becoming dominated by Japanese-made imports which used the more efficient LCD displays.
However, as a programmable calculator it was pretty useful and came with an impressive 3 volume programming library (Maths, Physics and Engineering), including a lunar-landing game!


Specification :

8-digit display Red LED display
Power : 9v PP3 or mains adapter
Integrated circuits - National Semiconductor MM57146AEG/N, MM57126N, DS8874N
Programming steps: 79

Box with mains adapter and program libraries.